In Septemeber, 1929, during a routine roentgen gastro-intestinal examination of a child, certain signs, described here, were correctly diagnosed as being caused by Ascaris in the intestinal tract. This led to a study of the English literature, and no reference to this phenomenon was found, so experimental work was started on a group of children infested with Ascaris.
A subsequent search of the foreign literature has revealed several references. Fritz,1 in 1922, was the first to recognize the roentgen appearance of intestinal ascariasis, using a barium contrast meal. He described two cases. Schinz,2 in 1924, added another case, while Fritz,3 in the same year, again reported several additional cases. Busi,4 in 1924, Giovetti,5 in 1925, Lapenna,6 in 1926, and Vietti,7 in the same year, all reported cases, Vietti having a series of sixty-five. Hugo Laurell,8 in 1927, covered the entire field of