In Septemeber, 1929, during a routine roentgen gastro-intestinal examination of a child, certain signs, described here, were correctly diagnosed as being caused byAscarisin 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 withAscaris. A subsequent search of the foreign literature has revealed several references. Fritz,1in 1922, was the first to recognize the roentgen appearance of intestinal ascariasis, using a barium contrast meal. He described two cases. Schinz,2in 1924, added another case, while Fritz,3in the same year, again reported several additional cases. Busi,4in 1924, Giovetti,5in 1925, Lapenna,6in 1926, and Vietti,7in the same year, all reported cases, Vietti having a series of sixty-five. Hugo Laurell,8in 1927, covered the entire field of