Animal physiology / by John G. M'Kendrick.

  • John Gray McKendrick
Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: Animal physiology / by John G. M'Kendrick. Source: Wellcome Collection.

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    corpuscles varies, being oval in fishes, reptiles, and birds (fig. 68). In all mammals they are circular, with the exception Fig. 67-—Blood-corpuscles; a, two Fig. 68-—Blood-corpuscles of various of the camels and llamas, where they are oval (fig. 68,/). 114. Blood-co7'puscles of Various Animals.—The coloured blood- corpuscles of all mammals have no nucleus, swell up and become globular on the addition of water, and almost entirely disappear in weak acetic acid. The coloured corpuscles of birds, reptiles, and fishes have a nucleus which is readily seen on the addition of water or acetic acid. Acetic acid renders the body of the colourless corpuscle clear and transparent, and reveals the exist- ence of two or more nuclei, usually clustered together. 115. Coagulation of the Blood.—Shortly after its removal from the body, the blood begins to thicken or coagulate, and soon separates into two distinct parts, one of them being a dark-red jelly or clot., which is the heavier of the two, and sinks ; while the other is a clear straw-coloured fluid, called the serum., which covers the clot. This depends on the formation of a substance called fibriney which forms a meshwork of fine molecular fibres, entangling the corpuscles. When a coagulum appears, fibrine is produced by the union of two substances present in solution, one called fibrinogen^ and the other termed fibrino-^plastic substance, the latter probably being a substance known as globulin^ which forms a large part of the coloured corpuscles. coloured corpuscles shewing shad- owed appearance in the centre, indi- cating biconcave form; b, corpuscle seen edgeways ; c, slightly oval cor- puscle ; dy colourless corpuscle; e, coloured corpuscles in rouleaux. Animals magnified to, the same scale: a, from proteus; b, sala- mander ; c, frog ; d, frog after addi- tion of acetic acid, shewing nucleus ; bird ; camel; g, fish ; h, crab or other invertebrate animal.
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