The author, commissioned by the International Institute of Statistics, has undertaken an extensive survey on the incidence of cancer in the large cities of the world, usually those of more than 500,000 inhabitants. It includes the United States and Canada, Argentina, Chile, Peru, British India, Japan, Egypt, the South African Union, Australia, New Zealand, and all the European countries except Yugoslavia, Turkey and Russia. The statistics cover the general incidence of cancer in five year age groups, separated according to sex. Only cancer of the oral cavity, the respiratory tract, the intestinal tract, the breast and the uterus are discussed separately. It is interesting to note the uniform age distribution of cancer in such heterogeneous populations as those in the United States and Japan. Also a comparison of the cancer deaths of the same population in different years shows a striking uniformity. The comparison of the death rate in the