1906.] 



OF MONKEYS IN THE MENAGERIE. 



561 



about another two weeks has disappeared, so that the female at 

 a distance is indistinguishable from, the male. After a few days' 

 rest inflammation again sets in and is almost at once followed by 

 the appearance of hpemorrhage. 



In the case of the female Ohacma, the data upon which the 

 foregoing epitome is, in the main, based ai-e as follows : — 



12 



14 

 15-18 

 19-20 



21 



size. 

 Swelling nearly dis- 

 appeared. 



5) _ 55 55 



No swelling. 

 "Very slight swelling 

 and imflammation. 



Hpemorrhao-e started. 



Thus between four and five weeks — or, to be more accurate, 

 thirty-two days — elapsed between the cessation of the haemorrhage 

 in April and its recommencement in May, and nearly four weeks — 

 that is to say, twenty-seven days — between its cessation in May 

 and its recommencement in June. 



The period of "heat" in this Baboon may therefore be described 

 with perfect accuracy as " menstrual," i.e. of monthly occurrence. 



Hsemorrhage does not, however, take place in all female 

 Baboons. There is, for example, a young female W. -African 

 Baboon [Fa^no sphinx), now living in the Gardens, in which there 

 is no show of blood ; and although the swelling indicative of 

 "heat" arises, it does not reach the enormous size characteristic 

 of the Chacma, but involves merely the median subcaudal area of 

 the rump without extending laterally over the ischial callosities. 

 I do not know whether this . is an individual peculiarity, or 

 whether it is typical of the species, or whether it is merely 

 assignable to the youth of the Baboon in question. 



So far as my experience goes, haemorrhage does not, as a rule^ 

 occur — or only occurs in a negligible quantity — in females of the 



38* 



