1906.] OF MONKEYS IN THE MENAGERIE. 569 



The mother of this one died a few days after its birth, but 

 the uterus was in too septic a condition for any satisfactory 

 examination. 



In all cases where the young were born alive the thing that 

 struck me most was the extraordinary strength and activity they 

 displayed practically immediately after birth. The one I saw 

 when it Avas certainly not more than twenty minutes old could 

 already cling by itself to its mother whilst she climbed about the 

 cage. They hold on to the mother's fur by both hands and feet, 

 and frequently also hold the nipple in their teeth. I am not able 

 to form any opinion as to how long the young suckle ; they can 

 certainly eat solid food within less than a month of birth. One 

 young Rhesus I had was born not more than a week before arrival . 

 The mother died when it was between three weeks and a month 

 old, and I had no difficulty in rearing it by hand, as it could 

 drink and eat soft food. 



One Monkey born here I kept with its mother for six months, 

 and another for about seven. Both these young animals suckled 

 all the time, although they also, during the greater part of it, 

 shared the ordinary food given to the mothers. 



The last point that is at all useful is the fact that young Rhesus 

 Monkeys are born completely covered with hair, in all respects 

 resembling the hair of the adult animal. I think that probably 

 this is a feature in which they differ from Anthropoids. 



I have reason to believe that Chimpanzees are born entirely or 

 nearly naked. I have had eight young Chimpanzees imported. 

 They were not less than six months old, though one of them was 

 certainly more. Seven of these animals had very little hair indeed ; 

 most of them were practically naked on the ventral surface, but 

 had scanty fur on the head and back. I have had a large number 

 of other young Chimpanzees, but all of them had good coats. 

 Unfortunately, all the seven uncovered young ones died of 

 broncho-pneumonia soon after arrival, so I had no chance of 

 observing when the coat appeared. 



I tried an experiment to see if Rhesus would breed in captivity. 

 One of the mothers whose baby had actually been born here was 

 very tame and not easily frightened. I kept her with the young 

 one, suckling all the time, for six months. I then put her in 

 another large cage with an adult male Rhesus, and kept them 

 together for another six months. During the whole of the time 

 they were together they copulated frequently. Both my man and 

 I witnessed this on many occasions. I then kept the female alone 

 for three months. She had the appearance of being pregnant 

 (enlarged abdomen and swollen breasts). At the end of three 

 months she became ill and died. On post-mortem examination 

 there was no sign of pregnancy. The uterus was no larger than 

 that of an ordinary adult Rhesus, and the ovaries, &c., were 

 normal. The post-m.ortem did not reveal the cause of death. 



I cannot say anything about menstruation in the Rhesus during 

 pregnancy or suckling, as I have not been able to make reliable 



