The subject of helminthiasis in children has been revived in the literature in the last few years. The statistics as given in the text-books have been drawn from the clinical work in hospitals and private practice and are naturally inaccurate, as many of the cases show no symptoms and the clinical examinations have not been controlled by careful laboratory examination. In the last few years, however, there have been two investigations reported, based on thoroughly scientific work. The earlier work, that of Stiles and Garrison, reported in 1906, gives a thorough digest of the voluminous literature and was practically the only report on the subject in the United States until Schloss reported his series of 310 cases from the clinics of three hospitals in New York. The latter report was the direct stimulus for the present investigation. The percentage of infections (28.57 per cent.) reported in this paper being so