Elements of histology / by E. Klein.

  • Klein, E. (Edward) 1844-1925.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Elements of histology / by E. Klein. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    circulating blood or in Ijlood tliat has just been removed from the vessels. Their suV)stance is trans- ])arent granular-looking protoplasm, containing larger or smaller bright granules. These granules, tliough usually of a fatty nature, are in some kinds of blood, notal)ly horses', of a reddish colour, and these corpuscles are supposed by some observers (Semmer and Alexander Schmidt) to be inter- mediate between red and white corpu.scles. The protoplasm of the colourle-ss corpuscles contains glycogen (Raiivier, Schtifer). In the blood of the lower vertebrates the colourless corpuscles are much larger than in mammals. But in all cases they consist of protoplasm, include one, two, or more nuclei, and show amoeboid movement. This may be observed in corpuscles without any addition to a fresh microscopic specimen of blood, but it always becomes much more pronounced on applying artificial heat of about the degree of mammals' blood. It is then seen that they throw out longer or shorter filamentous processes, which may gradually lengthen or be withdrawn, appearing again at another point of the surface. The corpuscle changes its position either by a flowing movement of its protoplasm as a whole, thus rapidly creeping along the field of the microsf;ope, or it may push out a filamentous process and shift the rest of its body into it. During this movement the corpuscle may take up granules from the surrounding fluid. 14. The white corpuscles of the same sample of blood differ in size and aspect within considerable limits, some being half the size of others, some much paler than others. Tlie smaller examples generally possess one nucleus occupying the greater part of the corpuscle, the larger ones usually include two, three, or even more nuclei, and show more decided amoeboid movement than the others. Division by