1906.] OF MONKEYS IN THE MENAGERIF. 563 



inactivity of the Monkey, which was out of health and habitually 

 sat with her knees pressed against her abdomen and her arms 

 folded across them. The Rhesus, however, who was very active, 

 showed decided signs in the enlargement of the nipples and the 

 swelling of the abdomen, more particularly in its anterior portion 

 behind the thorax. As compared with the human species the 

 alteration in appearance due to pregnancy was small, although 

 the foetus was comparatively larger in the Monkey. A week or 

 two before the birth of the young, the Rhesus in one night lost 

 all the hair off her cheeks. The skin was perfectly healthy, and 

 looked as if it had been shaved clean. The bareness gradually 

 spread on to the front of the shoulders and chest, extending 

 ultimately to and round the nipples. It persisted until the young 

 was about six weeks old ; but within two months of birth the 

 naked areas were covered with a coating of short hair. 



Period of Gestation. 



A small and not fully grown specimen of the Pig-tailed 

 Macaque [Macacus nemestrinus) was observed to be in season in 

 the latter part of August, 1905 *, and to be covered more than 

 once by a male of the so-called Common Macaque (il/. fascicularis). 

 There was no subsequent menstruation. . Hence it may be inferred 

 that conception took place some time between the middle of 

 August and the beginning of September. 



Soon afterwards the Monkey was removed from that cage and 

 placed, together with another female of the same species, in a 

 cage with an adult male hybrid between a Pig-tailed and Common 

 Macaque bred in Singapore by Mr. H. IS". Ridley. The behaviour 

 of this male towards the two females was markedly diflerent. 

 Beyond tyrannising over the female in question and keeping her 

 in a state of nervous subjection, he treated her with complete 

 indifference. The other female, on the contrary, was regarded 

 with decided favour. Possibly his disregard for the pregnant 

 female was due to her condition. This may have brought about 

 some subtle change in her, a difference or deprivation of odour 

 may be, which perhaps robbed her of an attractiveness she might 

 otherwise have held for him. In the winter she was placed in 

 another cage and was not in company with a male Monkey of any 

 kind until the young was born on March 1st. 



Judging by analogy of the human species, the foetus was very 

 nearly, but not quite, at full term. The nails were completely 

 formed ; but the testicles had not descended into the scrotum. 

 They had passed out of the abdominal cavity and were lying in 

 the pelvic rim, the left a little lower than the right. Inguinal 



* I am able to fix this date within a few weeks from the testimonj- of one of the 

 keepers, Rodwell, who being a newly appointed and inexperienced hand was pro- 

 foundly impressed by the excessive inflammation of the genito-anal area exhibited 

 by the Monkey at the time. This man came on duty on Aug. 7th, and assures me 

 that he noticed the phenomenon within the following week or two. 



