TROGLODYTES NIGER, THE CHIMPANZEE 559 



huildiii^f was rcsiinu-ci and 1 lu- structure continued to ^n'ow in hciglit until it 

 hccamc an object ol vwv greater excitt-ineiit to the assi'inhk-d workers, each 

 manifesting a still keetn'r desire to mount it. As the result of this highly 

 indi\idualistic competition, the obji-ct ol their mam interest tumbled over 

 and was destroyed in tiie struggle. In consec|uence, it was necessar\' to begin 

 the structure all over again and, perhaps, m the continued ellort only the 

 more diligent and patient ol the grou]) adhert'd to the original purpose. The 

 others became interested m some less exacting occupations which imposed no 

 actual strain ol cooperation upon the individual. E\'entuall\, ho\\e\er, the 

 tower was linished and the more diligent as wfll as the more tenaciously 

 patient ol the animals, w ithout the obtrusive assistance ot'restlcss companions, 

 ciUK'tly mounted to the summit ol tin- structure, and either with or without 

 the aid ol the pole, obtained the co\eted tood. Sometimes, iiowexer, betore 

 the diligent one had time to reap the rt'ward ol his ellorts, some member 

 oi the group, endowed w ith more athletic alertness, stealthil\ and w ith great 

 spi'ed, clambered up to the point ol \antage to seize the prize w ith rapacious 

 deftness before the rightlul winner had time to |)rotest or retaliate. In all ol 

 this cooperati\e actnity there seems to l)e something so lundameiitally 

 human, so reminiscent even ol modern acc|uisiti\e proci'durt-, that it ap]X'ars 

 inaccurate to restrict it too rigidly within tlu' category of simian beha\ior. 



The chimpanzee's register ol emotion is greatc'r than that ol the a\erage 

 human being lor the reason that his whok' body i)t'comes agitated in such 

 expression; he shows his kx'Imgs iii other parts ol his b()d\ than merel\ his 

 facial muscles. It is his custom to jump up and dow n in |oylul anticipation as 

 well as m impatient annoyance and anger. In e\t ii'ine (U'spair, which seems to 

 develop as a result of but slight ])ro\ocation, he llings himself upon his back, 

 rolls \\ildl\ to and fro, swings and waves his arms abo\e his head in a lan- 

 tastic manner, not. Dr. Ktihler thinks, unlike the reactions among non- 

 Europtan races as a sign of disappointment and dejection. These anthropoids 



