It has always afforded me an infinite source of pleasure, to have it in my power, to present literary Gentelmen, with Such information, as I conceive of practical utility: as relates to the alleviation of the sufferings of mankind, induced by diseases:—and under the influences of an impression of this kind, I do with the greatest of pleasure, forward on to you, four copies of a little treatise on the use of Prussiate of Iron in intermitting and remitting remitting fevers; which you will doubtless receive at the time this letter reaches you—I shall consider myself highly honoured by receiving a few lines from you, by way of acknowledging, that they have come safe to hand—