Entomology Volume 1 ; Introduction to Entomology - James Duncan, Paperback

• Release Date   5/19/2012
• ISBN-13   9781236205278 | 978-1-236-20527-8
• ISBN   1236205278 | 1-236-20527-8
• Format   Paperback
• Author(s)   James Duncan
• This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1840 Excerpt: ...in the hand with a needle. The venom is a transparent fluid, of a sweetish taste when first applied to the tongue, but speedily producing a sharp burning sensation. Its chemical properties have not been properly examined. but according to Fontana, it is soluble in water, and when alcohol is added to the solution, it is precipitated in the form of a white powder, which converts vegetable blue into red. Its action is so powerful, that the writer just named calculates that a grain in weight would kill a pigeon in a few seconds. Allied to the preceding, are the acid secretions of ants and a few other insects, which, however, have not been traced to any special secreting organ, but seem to be diffused throughout the system. Vaquelin and Fourcroy conceived the former to be composed of acetic and malic acid, but Suensen has recently demonstrated that the earlier chemists were correct in regarding it as of a peculiar nature, and that the name Formic acid ought therefore to be retained. Berzelius gives the following analysis of it. hydrogen, 2, 84. carbon, 32, 40. oxygen, 67, 76. It is sometimes ejected by the anus. and Lacordaire affirms, that in tropical countries ants are to be met with (Gen. Ponera) armed with stings, which inflict as painful a wound as those of bees. Gallic acid has been obtained from the grain weevil, (Calandragranaria) and what has been named bombic acid from the silk-worm. It is probably one of these that is employed by certain Lepidoptera to loosen the end of their cocoons, when they wish to obtain egress. In the absence of special secreting vessels, the function is sometimes executed by the articulating membrane of the abdomen and limbs. Thus the wax, which is secreted by the neuters of the common hive-bee, is elaborated by the delicate me...