Through the courtesy of Swift and Co., Chicago, it was possible to get long pieces of infected pig intestines a very short time after slaughtering. These pieces had been in contact with water for only a few minutes. The figures found for glycogen and other substances in the worms thus obtained were somewhat higher than those previously reported, probably because this time the contact of the worms with water was practically eliminated. As an additional precaution, only females and males attached at nearby places of the intestine were used for the comparative chemical determinations. I am indebted to Dr. M. S. Ferguson for specimens of Leptorhynchoides thecatus from the sunfish, Eupomotis gibbosus, fixed with Carnoy's solution. Echinorhynchus coregoni was collected from infected perches, Perca flavescens, of Lake Michigan.
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Theodor von Brand (1940) studied this question.