Selected monographs.

  • New Sydenham Society.
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Selected monographs. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    basic, and here is the result. With eosin the corpuscles are stained pale rose, while the rest of the red globule is intensely yellowish red; the pigment remains unchanged. With vesuvin they stain red-brown. With tropaolin they are not stained at all, but are recognized, in the red globule stained a beautiful clear yellow, as so many spots containing pigment or not. Examining the fresh blood without any treatment, we see only the larger corpuscles appear as colourless and pigmented specks, as already described by Eichard. The red globules in which are found the corpuscles (small, round, analogous to micrococci) appear normal, or if there are specks, these are indistinguishable from the lacunae which are formed accidentally in normal red globules. The pigmented spots present various shapes, increase gradu- ally, and coalesce, so that the entire red globule is converted into a decolorized body of hyaline aspect, containing granules and masses of pigment. When it contains one or two pigmented corpuscles and still retains a distinct portion of its coloured protoplasm, it preserves its normal elasticity. When it is con- verted into a hyaline mass it sometimes preserves its elasticity; sometimes this is diminished, and the globule adheres to the slide or covering glass, does not move, or only moves slightly when pressed. The pigmented granules, which are found in the spotted globules as well as in those completely decolorized, assume various figures when the globules move, viz., circles round the periphery of the specks, circular groups or irregular forms. When the globules are at rest, the pigment granules are motion- less or move actively, especially those found in the serum on the blood clot. In preparations of fresh blood other forms of red globules are encountered, viz., such as present only one half decolorized and of a semi-lunar form, having in the centre or at a point of the periphery clusters of pigment; or such as have lost wholly or partially their haemoglobin and exhibit in the centre a single spot of black pigment, rounded, irregular, having somewhat the shape of an embryo. In addition are found round, hyaline, or irregularly pigmented bodies and richly pigmented white cells. On adding distilled water, the altered red globules first become shapeless, and