Behavior Monographs 



Volume I, Number 4, 1911 Serial Number 4 



Edited by JOHN B. WATSON 



The Johns Hopkins University 



The Biology of Physa 



JEAN DAWSON 



Department of Biology, Normal Training School, Cleveland, Ohio 



TEN FIGURES 



Contributions from the Zoological Laboratory of the University of Michigan, No. 



137. Accepted by the Faculty of the Department of Literature, Science 



and the Arts in partial fulfillment of the requirements for 



the Degree of Doctor of Philosophy 



Published 



at Cambridge, Boston, Mass. 



HENRY HOLT & COMPANY 



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