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 *tained in the hæmoglobin. He requires from one to two grains every day to make up for waste, and this he gets in the meat and vegetable food which he absorbs. The vegetables obtain iron from the soil, and animals acquire it from the corn, roots, or grasses which they eat. So far as is known it is from these sources only that human beings assimilate the iron they require. It is very doubtful whether a particle of the iron administered in any of the multitudinous forms which pharmacy provides is retained. A noted modern physiologist, Kletzinsky, says "From all the hundredweights of iron given to anæmics and chlorotics during centuries not a single blood corpuscle has been formed." For all that there is no medical practitioner of any considerable experience who has not found directly beneficial results follow the administration of these medicines in such cases.

To Sydenham and Willis, two of the most famous physicians of the seventeenth century, the general employment of iron as a medicine may be traced. Sydenham, in his treatise on hysteric diseases, which, he says, are occasioned by the animal spirits being not rightly disposed, and not as some supposed by the corruption of the blood with the menstrual fluid, points out that the treatment must be directed to the strengthening of the blood, for that is the fountain and origin of the spirits. In cachexies, loss of appetite, chlorosis, and in all diseases which we describe as anæmic, he recommends that if the patient is strong enough recourse should be had first to bleeding, this to be followed by a thirty days' course of chalybeate medicine. Then he describes, much the same as modern treatises do, how rapidly iron quickens the pulses, and freshens the pale countenances. In his experience he has found that it is