Histology of the blood, normal and pathological / by P. Ehrlich and A. Lazarus ; edited and translated by W. Myers ; with a preface by G. Sims Woodhead.

Date:
1900
Catalogue details

Licence: In copyright

Credit: Histology of the blood, normal and pathological / by P. Ehrlich and A. Lazarus ; edited and translated by W. Myers ; with a preface by G. Sims Woodhead. Source: Wellcome Collection.

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

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    want of the normal quantity of blood. This may be ] “general” and affect the whole organism; or “local” and j limited to a particular region or a single organ. The local anasmias we can at once exclude from our consideration. A priori, the amount of blood may be subnormal in two senses, quantitative and qualitative. We may have a diminution of the amount of blood—“Oligaemia.” Deterioration of the quality of the blood may be quite i independent of the amount of blood, and must primarily express itself in a diminution of the physiologically im- portant constituents. Hence we distinguish the following chief types of alteration of the blood; (1) diminution of the amount of Haemoglobin (Oligochromaemia), and j (2) diminution of the number of red blood corpuscles i (Oligocythaemia). j We regard as anaemic all conditions of the blood \ where a diminution of the amount of haemoglobin can be recognised; in by far the greater number of cases, if i not in all, Oligaemia and Oligocythaemia to a greater or j less extent occur simultaneously. I The most important methods of clinical haematology 1 bear directly or indirectly on the recognition of these conditions. There is at present no method of estimation of j THE TOTAL QUANTITY OF THE BLOOD which can be used | clinically. We rely to a certain extent on the observation of the already mentioned symptoms of redness or pallor of the skin and mucous membranes. To a large degree ] these depend upon the composition of the blood, and not j upon the fulness of the peripheral vessels. If we j take the latter as a measure of the total amount of | blood, isolated vessels, visible to the naked eye, e.g. | those of the sclerotic, may be observed. Most suitable ]