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Author: National Academy Of Sciences
Publisher: Forgotten Books
ISBN: 9780265930571
Category :
Languages : en
Pages : 206
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Book Description
Excerpt from Memoirs of the National Academy of Science, 1927, Vol. 19 From the various considerations already adduced it Will be quite clear that no general philosophy of petrogenesis should be based upon a study of a portion of the 1gneous recks alone, however complete-it might be' in regard to geological, petrographical, and physico-che'mical circumstances; and therefore, since no study of the intermediate and acid types of normal and alkaline 1gneous rocks has been made by the writer comparable in detail with those upon basic igneous rocks here given, it must be recognized that the generalizations which follow are derived perhaps too exclusively from the' study of basic rocks. If, however, they are found to be an adequate statement of the modes of occurrence of such rocks, they may then be combined with the results of s1m11ar studies upon the other types of rocks into a general petrogenetic theory. While no invariable rules for mode of occurrence of basic intrusive rocks seem yet dis coverable, there emerge from the studies which follow the conception of several modes of occur 'rence, so frequently represented that they' seem to result from fundamental principles of petrogenesis, while the exceptions to these are especially worthy of study, .s1nce in all probability they will throw most light upon the nature of the controlling conditions and the relationships to one another of apparently distinct modes of occurrence. 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: National Academy Of Sciences
Publisher: Forgotten Books
ISBN: 9780265930571
Category :
Languages : en
Pages : 206
Get Book Here
Book Description
Excerpt from Memoirs of the National Academy of Science, 1927, Vol. 19 From the various considerations already adduced it Will be quite clear that no general philosophy of petrogenesis should be based upon a study of a portion of the 1gneous recks alone, however complete-it might be' in regard to geological, petrographical, and physico-che'mical circumstances; and therefore, since no study of the intermediate and acid types of normal and alkaline 1gneous rocks has been made by the writer comparable in detail with those upon basic igneous rocks here given, it must be recognized that the generalizations which follow are derived perhaps too exclusively from the' study of basic rocks. If, however, they are found to be an adequate statement of the modes of occurrence of such rocks, they may then be combined with the results of s1m11ar studies upon the other types of rocks into a general petrogenetic theory. While no invariable rules for mode of occurrence of basic intrusive rocks seem yet dis coverable, there emerge from the studies which follow the conception of several modes of occur 'rence, so frequently represented that they' seem to result from fundamental principles of petrogenesis, while the exceptions to these are especially worthy of study, .s1nce in all probability they will throw most light upon the nature of the controlling conditions and the relationships to one another of apparently distinct modes of occurrence. 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: National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9781390925661
Category : Science
Languages : en
Pages : 1002
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, 1922, Vol. 16 Chief, bureau OF biological survey, united states department OF agriculture. 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: National Academy of Sciences
Publisher:
ISBN: 9781330478349
Category : Science
Languages : en
Pages : 324
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Excerpt from Memoirs of the National Academy of Sciences, Vol. 2 Sir: I have the honor to transmit to you, through the hands of Professor Coffin, the report of the committee of the Academy, to which was intrusted the arrangements for securing observations of the eclipse of May, 1883. It contains the reports and observations of Professor Holden and his associates in the expedition, and I have, in compliance with a request of the committee. prefixed a brief introduction, giving an account of the proceedings of the committee and of the organization of the party. 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: U. S. National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9780656228553
Category : Science
Languages : en
Pages : 776
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, Vol. 8 This work was undertaken at the instance of Dr. John S. Billings, Director of the Laboratory of Hygiene, University of Pennsylvania, with the view of obtaining, if possible, some explanation, from a bacteriological standpoint, of the greater mortality among persons living in houses built on made ground over those living on virgin soil. In some cities, as Washington and New York, filled localities can be mapped out and the course of old runs followed by the higher death rate in these districts. N 0 positive opinion can be based on the data so far obtained, and these notes are presented mainly as a small contribution to our knowledge of the bacteria of the soil. In the prosecution of the work I have had the advice of Dr. Billings and of Dr. A. C. Abbott, first assistant, to both of whom I am much indebted. 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: National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9780656047338
Category : Science
Languages : en
Pages : 354
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, Vol. 1 Those portions of the computations which I have not made in person have been made at my expense, and I desire to express my thanks to my pupils and assistants, Messrs. John N. Stock well, erving winslow, william H. Palmer, S. C. Chandler, jr., and S. S. Eastwood, for their valuable aid. Mr. Winslow has taken part in all the computations from the beginning. The catalogue contains 6497 observations of 2907 stars situated between the parallels of 500 north and 355 south declination. 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: National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9780266663928
Category : Science
Languages : en
Pages : 54
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, 1896, Vol. 8 The work has extended over a period of ten months, with considerable interruption during much of the time. Virgin soil was examined to a depth of 12 feet, samples having been obtained from the walls of an excavation at intervals of a foot. Samples of made soil were obtained in the same way to a depth of 9 feet. Other samples of both made and virgin soil were obtained by Frankel's earth borer to a depth of 55 feet. 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: National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9780282509620
Category : Social Science
Languages : en
Pages : 614
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Excerpt from Memoirs of the National Academy of Sciences, 1941, Vol. 23 3. Observations and measurements on the members of the National Academy of Sciences. By Ales Hrdlieka 1 - 108. 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: U. S. National Academy of Sciences
Publisher: Forgotten Books
ISBN: 9780332652955
Category : Science
Languages : en
Pages : 424
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, 1884, Vol. 3: Part 1 For the percentage transmitted by glass B were obtained the values 60 per per cent., and 58 per cent., giving a mean of 55 per cent. 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: National Academy of Sciences
Publisher:
ISBN: 9781332158966
Category : Science
Languages : en
Pages : 390
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Excerpt from Memoirs of the National Academy of Sciences, Vol. 9 The species of this group are all more or less protectively colored. Their grayish, brownish hues, with yellowish or sometimes greenish markings, harmonize with the tints of the bark of the trunk or branches of trees, whether grown over with lichens or not. In their shape and size, whether at rest or flying, they closely resemble the species of Noctuidae. They differ as a rule, however, in their slower flight, and in resting on the bark or among the leaves of trees, not nestling in grass or low heritage. There are almost no observations yet made on the protective attitudes of notodontian moths, and the subject needs to be carefully studied. Long and close observations in the field with the aid of the camera are needed before we shall have a satisfactory body of facts, and it is to be hoped that this line of study will be taken up by lepidopterists of future generations. Many observations have doubtless been made by breeders of moths, but not published. What we have to say is mainly in the line of suggestion. The colors and attitudes of the more typical members of the family, as the species of Notodonta, Pheosia, Lophodonta, etc., when at rest, with their tufts and the consequent production of angles and points, assimilate them with the bark of trees or twigs wich salient parts, buds, and other projecting points. Those who have seen species of geometrids, Ingura, etc., at rest, with their tails curled up and their wings partly spread out, will readily understand how the species of Apatelodes, Melanopha, etc., with their tufted abdominal tips, angulated wings, and bars and spots, would tend to conceal them from the prying eyes of birds. The species of Melalopha (M. inclusa and strigosa) sit with the wings folded sharply over the back, with the fore legs held straight out in front, and the tufted tail upcurved. (Monogr. Bombycine Moths, 1, p. 181.) The pale yellowish hues of Datana and Nadata, the latter with its high dorsal thoracic tuft, assimilate them with yellow and brown leaves. Here reference might be made to Professor Poulton's statement that the shape and color of Scoliopteryx lihatrix "forcibly suggest the appearance of a red leaf spotted with a few white bosses of fungoid growth." (Trans. Ent. Soc. London. 1887, p. 308.) Hyparpax aurora may be found, like Rhodophora florida, to frequent pink and yellow flowers. How the very unusual and conspicuous markings of Edema albifrous and of Nerice bidentata may mimic the dentate edges of leaves or projections of other objects will doubtless be eventually cleared up. The ground shades and tints of the species of Schizura and Heteroeampa, with their green and yellowish spots and streaks would, when the moths are resting on lichen-covered bark of their food trees, amply protect them from the observation of birds. This has been pointed out by Riley in the case of Schizura unicornis. 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: United States National Academy Sciences
Publisher:
ISBN: 9781332912780
Category : Science
Languages : en
Pages : 472
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Book Description
Excerpt from Memoirs of the National Academy of Sciences, Vol. 10 Such a ring could be added to or taken from the perfect ring without altering the period; hence any symmetrical system of fine lines or graduations could be made on the ring at the distance 7 from the center without sensibly altering its period. 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.
