PSYCHOLOGY — ZOOLOGY. 343 



and left hands and to the modifiabiUty of the use by practice. Another 

 study of the same general character has been made by Dr. Clarke 

 Kempf and the results are in process of publication. 



The experiments of Dr. Mildred E. Scheetz, on the location of the 

 stimulable areas of the monkey's brain, with special reference to the 

 area lying within the central or Rolandic fissure, have been completed 

 and await publication. 



Other experimental work on the motor cortex has been continued, 

 with special reference to the phenomena and the mode of recovery after 

 the destruction of the motor area. The account of the results of this 

 work will soon be published. Plans have been made to continue the 

 investigation to include those subcortical parts which are supposed to 

 assume the functions of the motor area when the latter is destroyed 

 or otherwise made incapable of function. 



ZOOLOGY. 



Castle, W. E., Harvard University, Cambridge, Massachusetts. Continu- 

 ation of experimental studies of heredity in small mammals. (For previ- 

 ous reports see Year Books Nos. 3-15.) 



In the year just ended the experiments with small mammals, out- 

 lined in previous reports, have been continued successfully. A large 

 portion of my time has been given to the immediate supervision of 

 experiments in progress and the preparation of material for publication 

 has been somewhat delayed. Nevertheless five short papers have been 

 published within the year — two by Mr. Dunn, three by myself — and 

 each of us has a more extensive paper nearing completion. A book. 

 Genetics and Eugenics, published in December by the Harvard Uni- 

 versity Press, contains, through the generous policy of the Carnegie 

 Institution, much material drawn from earlier publications, but here 

 presented in more popular form. 



The experiments with guinea-pigs secured in Peru in 1911 are nearing 

 completion and a final report upon them will, it is hoped, be submitted 

 soon. A report on certain of the rabbit experiments has been in manu- 

 script for several months and requires only the preparation in final 

 form of certain charts to make it ready for publication. 



For the coming year it is planned to discontinue work with guinea- 

 pigs altogether, to hmit the work with mice to a single problem, and 

 to concentrate on the work with rats and rabbits, which is presenting 

 new and interesting aspects. 



