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 better to give it in substance than in any of the preparations, “for busy chemists make this as well as other excellent medicines worse rather than better by their perverse and over officious diligence” (Pechey’s translation). He advises 8 grains of steel filings made into two pills with extract of wormwood to be taken early in the morning and at 5 p.m. for thirty days; a draught of wormwood wine to follow each dose. “Next to the steel in substance,” he adds, “I choose the syrup of it prepared with filings of steel or iron infused in cold Rhenish wine till the wine is sufficiently impregnated, and afterwards strained and boiled to the consistence of a syrup with a sufficient quantity of sugar.” [Illustration: DR. THOMAS SYDENHAM. 1624-1689. (Originator of Sydenham’s Laudanum.) ]