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Author: Th. Mortensen
Publisher: Forgotten Books
ISBN: 9780267959402
Category : Science
Languages : en
Pages : 146
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 5: Ctenophora On my asking Sir John Murray, whether it might be possible to get some specimens of these Planarians for examination, he kindly applied to the British Museum about the matter, and I had the pleasure to receive some specimens found among Crustaceans from that station. The examination of these specimens certainly left no doubt that they were really Planarians. The matter is, however, not definitely settled thereby. The specimens examined had no tentacles or processes, so that they could not have been described as having digitiform processes or a superior penis. It seems then not nu reasonable to suppose that there have really been some Coeloplmza among the Planarians, which have, however, become lost on account of the difficulty of preservation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author:
Publisher:
ISBN: 9781331942498
Category : Science
Languages : en
Pages : 582
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 4 The present work forms the first part of a planned revision comprising all the arctic Echinoderms, excepting the Holothurioidea. The basis of the work is formed by the rich material of the Ingolf-Expedition together with the large collections of arctic Echinoderms found at our Zoological Museum from earlier expeditions. To the arctic fauna all the species are referred which are found in the Norwegian Sea, the Greenland Sea, the Denmark Strait, and at the coast of West-Greenland, as also in the White Sea and the Polar Sea with the Bering Strait. Of forms that are only found south of the large ridge between Greenland and Iceland, and between Iceland and the Faroe Islands, only such as have been taken by the Ingolf-Expedition, have been included in the work. During the examination of the material the absolute necessity of taking into consideration also other more or less nearly related forms soon made itself felt. By and by I became aware of the fact that the classification hitherto used with regard to the families treated of here, was quite erroneous, and so I have sought to include into the examination as many forms as possible in order to be able to give the new classification that had to be made, so broad a base as possible. Inspector G. M. R. Leviusen placed the whole rich collection of Echinoids of the museum at my disposal with the greatest readiness; but as far from all species and genera are represented in this collection, I have applied to several foreign naturalists, and have everywhere been met with the most obliging kindness and friendliness, so that I have been enabled to examine almost all known genera and species comprised in the groups treated of here. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
Author: Th. Mortensen
Publisher: Forgotten Books
ISBN: 9780267959402
Category : Science
Languages : en
Pages : 146
Get Book Here
Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 5: Ctenophora On my asking Sir John Murray, whether it might be possible to get some specimens of these Planarians for examination, he kindly applied to the British Museum about the matter, and I had the pleasure to receive some specimens found among Crustaceans from that station. The examination of these specimens certainly left no doubt that they were really Planarians. The matter is, however, not definitely settled thereby. The specimens examined had no tentacles or processes, so that they could not have been described as having digitiform processes or a superior penis. It seems then not nu reasonable to suppose that there have really been some Coeloplmza among the Planarians, which have, however, become lost on account of the difficulty of preservation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Københavns Universitet
Publisher: Forgotten Books
ISBN: 9780260090188
Category : Science
Languages : en
Pages : 630
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Book Description
Excerpt from The Danish Ingolf-Expedition, 1914-1933, Vol. 4 The only station of the Ingolf, where this species was observed, is a vertical haul from the Davis Strait at 6306' N. L., 56° W. L. From a depth of 200 fathoms. In the deeper hauls of the Thor. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Elise Wesenberg-Lund
Publisher: Forgotten Books
ISBN: 9781334742866
Category : Science
Languages : en
Pages : 206
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Book Description
Excerpt from The Danish Ingolf Expedition, Vol. 4: 11. Tomopteridae and Typhloscolecidae The Ingolf Expedition has not taken this species. The following localities date from the Thor, the Michael Sars and the Dana. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
Author: Hjalmar Ditlevsen
Publisher: Forgotten Books
ISBN: 9781334734168
Category : Science
Languages : en
Pages : 110
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 4: 4. Annelids, I The present paper is the first part of the report on the Annelids brought home by the Ingolf expedition. Together with these, however, some other material of Annelids from Northern seas has been included. In this respect I shall name the rather considerable material brought home by several Danish naturalists on different expeditions to Greenland, Iceland and the Faroe Islands. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Elise Wesenberg-Lund
Publisher: Forgotten Books
ISBN: 9780484586177
Category : Science
Languages : en
Pages : 206
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Book Description
Excerpt from The Danish Ingolf Expedition, Vol. 4: 11. Tomopteridae and Typhloscolecidae The tail is not distinctly set off from the trunk. It is sausage - shaped and rounded at the end. It carries a number of rudimentary parapodia, the last of which are not even divided into a dorsal and ven t'ral ramus. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Danish Ingolf-Expedition
Publisher:
ISBN: 9781331942467
Category : Science
Languages : en
Pages : 376
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 1 According to the Financial Law of 1894 - 95, a sum of 30,000 Kroner was voted on the budget of the Ministry of Public Instruction for preliminary arrangements for a Danish scientific deep-sea expedition by the cruiser Ingolf for exploration of the Arctic seas around Iceland and Greenland, zoological collections being the principal object of the expedition. The expedition was to be made in two voyages of 4 months each, respectively in 1895 and 1896. On the 12th of April 1894, I received a communication from the Ministry of Public Instruction to undertake the necessary arrangements for the expedition together with professor Lutken, and on the 16th of the same month, I received another communication from the Ministry of Naval Affairs to inform me that I was appointed captain of the cruiser Ingolf and Leader of the expedition. The Ministry of Naval Affairs placed the cruiser Ingolf at disposal with officers and crew for the above purpose. Further on negotiations were entered into with the Naval Dockyard, and from these resulted that the principal alterations and fittings that had to be performed were as follows: Building of a deck-house aft with 3 cabins, a large one for the zoologists of the expedition, and two smaller ones, one of which for the physicist and the other for the botanist; fitting of a steam-winch with appertaining reel for the steel-wirerope; a reel for the thermometer-line; a trawl-boom with appurtenances, trawl and dredges as well as weights for soundings. The Ministry of Naval Affairs was not in favour of any alterations being made in the accommodation and fittings below deck, nor were any alterations in this respect necessary. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
Author: Th. Mortensen
Publisher: Forgotten Books
ISBN: 9781333830571
Category : Science
Languages : en
Pages : 288
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 4: 1. Echinoidea (Part I.) That under such circumstances erroneous determinations have been frequent, is not to be wondered at. I have had occasion to substantiate several (far too many!) cases, and such cases too where the greatest authorities have been responsible for the determination. We ought therefore to be very cautious in using the existing statements with regard to the geographical distribution of these forms. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Danish Ingolf-Expedition
Publisher: Forgotten Books
ISBN: 9781334732065
Category : Science
Languages : en
Pages : 292
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 4: Part 2; Contents-Th. Mortensen: Echinoidea (II) In the introduction to his memoir Professor Agassiz states that I show but little appreciation of the work of my predecessors, and De Meijere is included under this accusation, since he agrees with me in regarding the minute microscopical structures of pedicellariae and spicules as of considerable importance for classification. dr. Mortensen, savs Professor Agassiz, practically rejects all the work of his predecessors and challenges it as worthless because it is not based upon his methods for the solution of all Echinological problems. Like all classifications based upon a single character the results obtained culminate in such impossible associations that we are loath to follow his lead. i must protest against the temper and style of criticism adopted by Dr. Mortensen; even if he were right, his assumption of omniscience is offensive to the utmost, and his personal remarks are entirely out of place in a scientific memoir. He concludes these very unrestrained remarks with the following quotation from a newspaper: the results should diminish the patronizing certainty of knowingit all which distinguishes Dr. Mortensen's work, and forbids us, his predecessors, to discuss matters of which we must be in the nature of the case, wholly ignorant. First, as regards the temper and style of my criticism, I must confess my deep regret at having been so unhappy in my mode of expression. I always had and will have a very great respect for the author of that immense work the Revision of Echini, which must always remain the basis for the study of recent Echinoidea, even though its classification may prove untenable and the descriptions of genera and species more or less unsatisfactory. When mv examination of the original material in the British Museum led me to publish several corrections of the same author's Report on the chal lenger-echinoidea, I always endeavoured to give them in the simplest way, stating only the facts without comment or reproach, but, I confess, also without praise. This procedure, dictated though it was by my respect for the author of the revision of Echini, has had the unfortunate result that Pro fessor Agassiz has taken it as an offensive assumption of omniscience; for it is, of course, unreasonable to suppose that the eminent author has been tempted to ascribe offensiveness to the mere demonstra tion of errors. Once again, I repeat my deep regret at this result and can only state thati tried my best to avoid expressions which could be regarded as offensive. If I have been unsuccessful in this respect, that may perhaps be partly ascribed to the circumstance that my work has been translated from Da nish, in which language it was written by me. Probablv I may not be quite aware of the full significance of all the English expressions used, so that more may sometimes have been said than I have mean-t to say. That the errors found out had to be corrected, I think, everybody will agree; in any case I deem it the unconditional duty of every scientist to correct any erroneous statements he detects in literature, to prevent their going on and on in future literature, causing error on error, which will especially be the case with such statements occurring in the works of so famous an authority as Professor Agassiz. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
Author:
Publisher: Forgotten Books
ISBN: 9780656036530
Category : Science
Languages : en
Pages : 112
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Book Description
Excerpt from The Danish Ingolf-Expedition, Vol. 3 A comparison of the Cumacea from the Ingolf area with the world's fauna of the same order may be of some interest. In 1913 Stebbing states to have enumerated 309 accepted and 23 doubtful species; of the latter category the great majority will certainly disappear as unrecognizable for ever or synonyms, and only a few species have been established since 1913. If we therefore put the total number of valid species hitherto established to 315, we must be near the truth. Compared with that number 66 species from the In golf area is perhaps somewhat more than might be expected. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
