Excerpt from Anæmia, Vol. 1: Normal and Pathological Histology of the Blood
The term anaemia as it is applied in clinical medicine does not possess exactly the same meaning as the limitations which scientific investigation has imposed upon it would suggest. In the former certain prominent external symptoms are regarded as the characteristics of anaemic conditions: pallor of the skin and, as compared with the normal condition, a slighter degree of redness of the mucous membranes of the eyes, lips, oral cavity, and fauces. Not only is the existence of an anaemia deduced from the presence of these signs, but even the degree of the affection is measured by the extent of the symptoms.
It is obvious that a definition which is formulated on such a common and elementary symptom complex must include conditions which do not belong to it at all, while other conditions may perhaps be excluded which on account of their nature should be grouped with it. This fact is responsible for a number of uncertainties and contradictions.
It is therefore the first problem of a scientific consideration of anaemic conditions to carefully define their extent. The external symptoms mentioned above will be found to be little suitable for such a task, although it must be admitted that when applied in the proper place they are of practical importance.
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