BEGINNINGS OF INTELLIGENCE 179 
Hosnovsez, L. T. Mind in Evolution, ’01. 
Homes, 8. J. Pleasure, Pain and the Beginnings of Intelligence. 
Jour. Comp. Neur. Psych., 20, 145, ’10. 
The Beginnings of Intelligence, Science, 33, 473, 711. 
MarsHALL, H. R. Pleasure, Pain and Mesthetics, N. Y., 794. 
Spencer, H. Principles of Psychology, 1855. 
