On that I drew him out (as I thought), and he talked volubly. I was amazed to find this young man, in whose brain I had conceived thought kept one careless holiday, was evidently familiar with the physical sciences, and especially with chemistry, which was my own study by predilection. But never had I met with a student in whom a knowledge so extensive was mixed up with notions so obsolete or so crotchety. In one sentence he showed that he had mastered some late discovery by Faraday or Liebig; in the next sentence he was talking the wild fallacies of Cardan or Van Helmont. I burst out laughing at some paradox about sympathetic powders, which he enounced as if it were a recognized truth. "Pray tell me," said I, "who was your master in physics; for a cleverer pupil never had a more crack-brained teacher." "No," he answered, with his merry laugh, "it is not the teacher's fault. I am a mere parrot; just cry out a few scraps of learning picked up here and there. But, however, I am fond of all researches into Nature; all guesses at her riddles. To tell you the truth, one reason why I have taken to you so heartily is not only that your published work caught my fancy in the dip which I took into its contents (pardon me if I say dip, I never do more than dip into any book), but also because young ---- tells me that which all whom I have met in this town confirm; namely, that you are one of those few practical chemists who are at once exceedingly cautious and exceedingly bold,--willing to try every new experiment, but submitting experiment to rigid tests. Well, I have an experiment running wild in this giddy head of mine, and I want you, some day when at leisure, to catch it, fix it as you have fixed that cylinder, make something of it. I am sure you can." "What is it?" "Something akin to the theories in your work. You would replenish or preserve to each special constitution the special substance that may fail to the equilibrium of its health. But you own that in a large proportion of cases the best cure of disease is less to deal with the disease itself than to support and stimulate the whole system, so as to enable Nature to cure the disease and restore the impaired equilibrium by her own agencies. Thus, if you find that in certain cases of nervous debility a substance like nitric acid is efficacious, it is because the nitric acid has a virtue in locking up, as it were, the nervous energy,--that is, preventing all undue waste. Again, in some cases of what is commonly called feverish cold, stimulants like ammonia assist Nature itself to get rid of the disorder that oppresses its normal action; and, on the same principle, I apprehend, it is contended that a large average of human lives is saved in those hospitals which have adopted the supporting system of ample nourishment and alcoholic stimulants."