Chap. V. MONKEYS. 13*} 



reality of this yawning gesture, Mr. Bartlett insulted 

 an old baboon and put him into a violent passion; and 

 he almost immediately thus acted. Some species of 

 Maeacus and of Cercopithecus 14 behave in the same 

 manner. Baboons likewise show their anger, as was ob- 

 served by Brehm with those which he kept alive in Abys- 

 sinia, in another manner, namely, by striking the ground 

 with one hand, " like an angry man striking the table 

 with his fist." I have seen this movement with the ba- 

 boons in the Zoological Gardens; but sometimes the 

 action seems rather to represent the searching for a stone 

 or other object in their beds of straw. 



Mr. Sutton has often observed the face of the Maca- 

 cus rhesus, when much enraged, growing red. As he was 

 mentioning: this to me, another monkev attacked a rlie- 

 sus, and I saw its face redden as plainly as that of a man 

 in a violent passion. In the course of a few minutes, 

 after the battle, the face of this monkey recovered its 

 natural tint. At the same time that the face reddened, 

 the naked posterior part of the body, which is always 

 red, seemed to grow still redder; but I cannot positively 

 assert that this was the case. "When the Mandrill is in 

 any way excited, the brilliantly coloured, naked parts 

 of the skin are said to become still more vividly coloured. 



With several species of baboons the ridge of the fore- 

 head projects much over the eyes, and is studded with 

 a few long hairs, representing our eyebrows. These 

 animals are always looking about them, and in order to 

 look upwards they raise their eyebrows. They have 

 thus, as it would appear, acquired the habit of frequently 

 moving their eyebrows. However this may be, many 

 kinds of monkeys, especially the baboons, when angered 



14 Brehm, ' Thierleben,' B. i. s. 84. On baboons strik- 

 ing the ground, s. 61. 



10 



