40 TRAITS OF YOUNG CHIMPANZEES 



tracting Chim's to obtain hers. After a few repetitions of 

 simultaneous weighing of the two animals Panzee became so 

 accustomed to the basket that she would sit in it alone 

 quietly. This observation indicates, among other things, the 

 marked difference in adaptability of the two animals. 



Another illustration of adaptability is supplied by the reac- 

 tion of the animals to a home-made stadiometer which was so 

 planned that standing and sitting height could be readily 

 obtain,pd. The apparatus required that the animal be 

 stretched at full length on its back, with head firmly against 

 an upright headboard, legs stretched, and feet against a 

 movable foot-board. Naturally both Chim and Panzee 

 objected to being so placed. Chim, however, very quickly 

 learned to accustom himself to the unusual position and pro- 

 cedure and permitted us to make the readings satisfactorily. 

 For Panzee it required many more experiences to establish 

 the same degree of adaptation. 



The measurement of head height by the HrdHcka procedure 

 and with the use of the head caliper and an additional scale 

 placed on top of the animal 's head offered peculiar difiSculties 

 and was extremely alarming, if not also uncomfortable, to 

 the animals. It therefore provided a unique opportunity for 

 a rough measure of adaptability. What disturbed the 

 animals most was having the ends of the head calipers in- 

 serted in the external auditory meatus. Neither Chim nor 

 Panzee became reconciled to this experience. Each time 

 the measurement had to be repeated, Chim fought the inser- 

 tion of the tips of the calipers. In at least three instances, 

 after repeatedly pushing aside the calipers and preventing 

 the observer from securing a reading, Chim suddenly became 

 quiet and let us apply the calipers and make the reading with 

 entire satisfaction. It was as though after repeatedly ex- 



