Time does not permit us even to refer to the great mass of more or less similar views and corroborative evidence scattered in books and current literature during the last fifty years, but a few more references may be given. In 1884, and again lately, Merriam has called attention to cancer occurring as a reversion of tissue cells to earlier or embryonic forms under the influence of a disordered, or as he calls it, a poisoned blood stream, from over nutrition from a meat diet; and Haig has long maintained that uric acid is a prominent factor in the etiology of cancer. While few will agree with Haig in all his conclusions, there is no doubt but that a faulty nitrogenous metabolism plays a not inconsiderable part in the causation of many diseased conditions, as has been also shown in a previous lecture to be true in regard to cancer: and while it may not be actually uric acid or urea which does the harm, as these are relatively harmless end products of metabolism, it is true that the purin and xanthin bases, of many forms, and imperfectly oxidized nitrogenous elements, are active agents in the production of disease. Venus and Isenberg have both written very strongly in regard to the unquestioned value of a vegetarian diet in cancer, the former citing many supporters of the view, from ancient times to the present. If time permitted any amount more of corroborative evidence could be given in regard to the connection of cancer with metabolic disorders. There have been many scattered articles concerning the chemico-pathology of cancer, all looking in much the same direction as that which we are pursuing, which cannot even be alluded to, but brief mention must be made of a most illuminating and suggestive study by Bristol. Reviewing the many theories of the etiology of neoplasms he shows pretty clearly that cell reproduction comes from outside the cell, or from the surrounding cell medium by a process of diffusion, or by a definite chemical attraction, and is closely associated with the nutrition and growth of the cell, especially the nucleus; also that a fixed ratio between the salts in the blood, lymph, and tissues is necessary for normal activity and reproduction of cells; further that a disturbance in this ratio and an upset in the chemical equilibrium will lead to abnormal metabolism, growth, and reproduction, and result in an atypical growth in the local area involved.