1. According to the United States Mortality tables for 1912 there were 44,531 deaths from cancer that year, or 77 per 100,000 living, while the rate in 1911 was 74.3, an increase of 2.7. Tuberculosis has shown a steady decline, the death for 1912 being the lowest on record, 149.5 per 100,000, it having fallen from 200 per 100,000 in 1900, or over 25%.

2. No attempt has been made to collect an extensive bibliography, which might cover many pages, and a list is only given of those books and journal articles which I have been able to personally consult and to refer to in the text.