Although it is commonly known that intestinal parasites are very prevalent in China, but little definite statistical work has been done, and so far as can be ascertained none in this province of Kiang Su. China, considered medically, is rather an indefinite term with its great extent of territory and its hundreds of millions of people. The eighteen provinces vary in many important essentials as: 1. Climate; from the arctic cold of the northern to the tropical heat of the southern. 2. Elevation; from the plains and level provinces to the mountainous. 3. Density of population; from 30 to a square mile to 600. 4. Amount of rainfall. Therefore, it is quite probable that the prevalence of intestinal parasites in one province will be quite different from that in another.
The present series of examinations of stools of Chinese was made at the laboratory of St. Luke's Hospital, Shanghai, through