The following work was done at the University of Chicago Zoological Laboratory under the supervision of Dr. W. J. Crozier to investigate primarily the method of innervation of the food reflex. For the studies, various forms of common snails were experimented with, but the domestic snail known as the Singapore was used for most of this work because of its ready availability and suitableness for the work due to its large size, activity and omniverousness. The main objection to them is that they do not swim on the surface of the water as do many forms. In order to obviate this difficulty they were studied by placing the snail to be observed in a Petri dish on the stand of a dissecting microscope and watching its movements along the bottom of the dish with the aid of the reflecting mirror. It was found that the snails varied considerably in physiological activity, so that during the experiments it was often necessary to discard an animal because of inactivity, necessitating work with a considerable number of individuals in order to get approximately accurate results.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Johns, E. W.
"Some Food Reactions of Snails,"
Proceedings of the Iowa Academy of Science, 30(1), 181-184.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/39