Studies on the Cytoplasmic Components in Fertilization : I. Ascaris suilla

ABSTRACT This study of the cytoplasmic components was done on the fertilized eggs of Ascaris suilla. This species of Ascaris is found in the intestinal tract of the common domestic hog and is identical morphologically with Ascaris lumbricoides, the roundworm found in man. It has been proved conclusively by several of the Japanese workers that although Ascaris suilla is morphologically identical with Ascaris lumbricoides, it is physiologically a distinct species in that Ascaris suilla will not live in the medium of the human intestine, and Ascaris lumbricoides will not live and grow in the intestine of the hog.