374 The Animal Mind 



820. YERKES, R. M., 1907. The dancing mouse. New York. 



821. 1909. Modifiability of behavior in its relation to the age 



and sex of the dancing mouse. Jour. Comp. Neur. and 

 Psych., vol. 19, p. 237. 



822. - - 1912. The intelligence of earthworms. Jour. Animal 



Behav., vol. 2, p. 332. 



823. - -1915. The role of the experimenter in comparative psy- 



chology. Ibid., vol. 5, p. 208. 



824. 1916. The mental life of monkeys and apes. Behav. 



Monographs. 



825. YERKES, R. M., and AYER, J. B., 1903. A study of the reactions 



and reaction time of the medusa Gonionemus murbachii to 

 photic stimuli. Am. Jour. Physiol., vol. 9, p. 279. 



826. YERKES, R. M., and COBURN, C. A., 1915. A study of the 



behavior of the pig Sus scrofa by the multiple-choice method. 

 Jour. Animal Behav., vol. 5, p. 185. 



827. YERKES, R. M., and DODSON, J. D., 1908. The relation of 



strength of stimulus to rapidity of habit formation. Jour. 

 Comp. Neur. and Psych., vol. 18, p. 459. 



828. YERKES, R. M., and ESSENBERG, A. M., 1915. Preliminaries 



to the study of color vision in the ring dove, Turtur risorius. 

 Jour. Animal Behav., vol. 5, p. 25. 



829. YERKES, R. M., and HUGGINS, G. E., 1903. Habit formation 



in the crawfish, Cambarus affinis. Harvard Psych. Studies, 

 vol. i, p. 565. 



830. YERKES, R. M., and MORGULIS, S., 1909. The method of 



Pawlow in animal psychology. Psych. Bull., vol. 6, 



P- 257- 



831. YERKES, R. M., and WATSON, J. B., 1911. Methods of studying 



vision in animals. Behavior Monographs, vol. i, no. 2, 

 serial no. 2. 



832. YOAKUM, C. S., 1909. Some experiments on the behavior of 



squirrels. Jour. Comp. Neur. and Psych., vol. 19, p. 541. 



833. YUNG, E., 1892. La fonction dermatoptique chez le ver de 



terre. C. r. et Trav. Soc. Helv. Sci. nat., 1892, p. 127. 



834. - 1893. La psychologic de 1'escargot. Ibid., 1893, 



p. 127. 



835. 1903. Recherches sur le sens olfactif de 1'escargot (Helix 



pomatia). Arch, de Psych., t. 3, p. i. 



