BEGINNINGS OF INTELLIGENCE 179 



HOBHOUSE, L. T. Mind in Evolution, '01. 



HOLMES, 8. J. Pleasure, Pain and the Beginnings of Intelligence. 



Jour. Comp. Neur. Psych., 20, 145, '10. 



The Beginnings of Intelligence, Science, 33, 473, '11. 

 MARSHALL, H. R. Pleasure, Pain and Aesthetics, N. Y., '94. 

 SPENCER, H. Principles of Psychology, 1855. 



