Want of evidence renders it difficult to determine the exact influence of race upon the inception of the disease, but all the information we possess seems to indicate that savage peoples enjoy a comparative immunity. In Central Africa the negroes appear to be seldom affected, while in the southern portion of that continent the coloured inhabitants rarely fall victims to the disease, which, however, is very rife among the white population and the crossbreeds. Landry found cancer to be rare among the aborigines of Canada, and it is also said to be infrequent among those of New Zealand. According to the Tenth Census Eeport of the United States, the cancer deathrate was 27.96 per 100,000 whites and 12-17 per 100,000 blacks.
In India both Mohammedans and Hindoos are equally affected, while among the Chinese superficial carcinomata are common, but the gastric lesion is comparatively rare. It is interesting to observe that in civilised countries the aliens usually suffer more from malignant growths than those born in the country. Thus, among the entire population of Australia over twenty-one years of age, Mullins found that the death-rate from cancer of those born in Germany was one in 538, of those born in the United Kingdom one in 748, and of those born in Australia one in 2,738. From these and other similar facts he concluded that about three-fourths of the total mortality from the disease was borne by the immigrant population. The researches of Osier and McCrae at the Johns Hopkins Hospital point to a similar conclusion, for they found that the native-born, who constituted 78-3 per cent, of the patients, supplied only 57*3 per cent, of the cases of gastric cancer, while the foreignbom element, which formed only 21.7 per cent, of the patients, contributed no less than 42.7 per cent, of the cases of that disease. They also draw attention to the fact that, according to the census of 1880, the death-rate from cancer per 100,000 living was 20.08 for the native-born and 53.3 for the foreign-born. Finally, they make the interesting statement that' a lower deathrate (from carcinoma of the stomach) is found in children of mothers born in the United States, the highest being in those of mothers born in Germany. This is most marked in the cases over sixty-five years of age, being 42.72 in children of native-born mothers and 123.62 in the children of mothers born in Germany.'
It has been asserted, although upon what authority we have been unable to discover, that the Jews are seldom affected by gastric cancer. Our own experience has convinced us that far from being comparatively immune, the Jewish race is particularly prone both to cancer and to simple ulcer of the stomach; while according to Billings the death-rate from cancer among the Jews of the United States is the same as that of the rest of the white population.