In regard, then, to the actual medical treatment employed I may say that in the Skin and Cancer Hospital, and also in private practise, these patients are almost always first given a certain mixture with which you are familiar, ℞ Potassæ acetatis ℥, Tinct. Nuc. Vom. ℥ss, Extract. Cascar. fl. ℨi-ℨv, Extract. Rumicis radicis fl. ad ℥iv, the amount of cascara being varied according to the action of the bowels, which should move freely twice daily. This commonly acts also somewhat on the urine. This mixture is always taken three times daily, half an hour before eating, in one third of a tumbler of water. It is interesting to note that Forbes Ross, a London cancer surgeon, whose untimely death has deprived us of a valuable scientific worker along our present lines, was an ardent advocate of potassium in the treatment of cancer, whose value he established on biochemical as well as clinical grounds. He, however, pushed the administration of the salts of potassium far in excess of that which I have found necessary. He has related instances of advanced cancer in which the results were remarkable, and one of them, a case of cancer of the uterus in a widow aged 59, was quite a counterpart of one which I shall narrate to you next week. I wish I could give you _in extenso_ some of the remarkable arguments from microscopic and chemico-physiological study which he gives, to explain how potassium has such a controlling effect on cancer cells; but it is quite out of the question in a lecture such as this to enter fully into every enticing field of inquiry, and I must refer you to his valuable work. I am quite aware that when published this book was the subject of some criticism and even ridicule, but reviewers could not have properly grasped the whole book, which was simply so far ahead of the times that it was not understood. Cancer was then, even more than now, in the grip of the surgeon, who resented any thought of treatment other than by the knife.