Book [PDF] Garden Ferns Or Coloured Figures And Descriptions With The Needful Analyses Of The Fructification And Venation Of A Selection Of Exotic Ferns Adapted For Cultivation In The Garden Hothouse And Conservatory Download

Garden Ferns; Or, Coloured Figures and Descriptions PDF

Author: Sir William Jackson Hooker
Publisher:
ISBN:
Category : Ferns
Languages : en
Pages : 280

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Garden Ferns, or, coloured figures and descriptions, with the needful analyses of the fructification and venation, of the Ferns best adapted for cultivation in the garden, hothouse, and conservatory ... The drawings by W. Fitch PDF

Author: Sir William Jackson Hooker
Publisher:
ISBN:
Category :
Languages : en
Pages : 348

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Author: William Edward Shuckard
Publisher: LOVELL REEVE & CO
ISBN:
Category :
Languages : en
Pages : 213

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GENERAL HISTORY OF BEES. The bees constitute a family of the order Hymenoptera, viz. insects ordinarily, but in the case of bees always, with four transparent wings, which are variously but partially traversed longitudinally and transversely with threads, called nervures, supposed to be tubular, the relative position of which, together with the areas they enclose, called cells, help to give characters to the genera. Most of the Hymenoptera further possess some kind of an ovipositor,—of course restricted to the females,—varying considerably in the different families. This is sometimes external, but is often seated within the apex of the abdomen, whence it can be protruded for the purpose of depositing the egg in its right nidus. In our insect this organ is converted into a weapon of defence 18and offence, and forms a sting, supplied by glands with a very virulent poison, which the bee can inject into the wound it inflicts. It is not certain that this organ is used by the bee as an ovipositor, although it is evident it is its analogue. This brief description of the essential peculiarities of the family will, for the present, suffice. In the notice of the imago, I shall enlarge upon the general structure, and then particularize those portions of it which may facilitate further progress. The Egg.—Although the egg of the parent is the source of the origin of the bee, we cannot abruptly commence from this point, for the preliminary labours of the mother are indispensable to the evolution of its offspring. This egg has to be placed in a suitable depository, together with the requisite food for the sustenance of the vermicule that will be disclosed from it. Instinct instructs the parent where and how to form the nidus for its egg. These depositories differ considerably in the several genera, but, as a general rule, they are tubes burrowed by the mother either in earth, sand, decaying or soft wood, branches of plants having a pith, the halm of grain, cavities already existing in many substances, and even within the shells of dead snails. These perforations are sometimes simple, and sometimes they have divergent and ramifying channels. Sometimes they are carefully lined with a silky membrane secreted by the insect, and sometimes they are hung with a tapestry of pieces of leaves, cut methodically from plants, but some leave their walls entirely bare. All these particulars I shall have ample opportunity to note in the special descriptions of the genera. I merely indicate them to show how various are the receptacles for the offspring of our bees. Before the egg is placed within its nidus, this is supplied with the requisite quantity of food needful for the support of the young to the full period of its maturity. The receptacle is then closed, and the same process is repeated again and again until the parent has laid her whole store of eggs. In other cases one tube, or its ramification, contains but one egg. These eggs are usually oblong, slightly curved, and tapering at one extremity; they vary in size according to the species, but are never, however, above a line in length, and sometimes they are very minute. When the stock of the mother bee is exhausted she leaves them to the careful nursing of nature, and the young is speedily evolved. She then wanders forth; time has brought senility; her occupation has gone; and she passes away; but her progeny survive to perpetuate the continual chain of existence. To be continue in this ebook...

The naturalist in Norway; or, Notes on the wild animals ... of that country PDF

Author: John Bowden (LL.D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 452

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Journal of Botany, British and Foreign PDF

Author: Berthold Seemann
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 480

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The Natural History and Scientific Book Circular PDF

Author:
Publisher:
ISBN:
Category : Natural history
Languages : en
Pages : 424

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Author: William Jackson Hooker
Publisher: BoD – Books on Demand
ISBN: 3375032765
Category : Fiction
Languages : en
Pages : 278

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Book Description
Reprint of the original, first published in 1862.

Author:
Publisher:
ISBN:
Category : Bibliography
Languages : en
Pages : 1070

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Book Description
Vols. for 1871-76, 1913-14 include an extra number, The Christmas bookseller, separately paged and not included in the consecutive numbering of the regular series.