430 



DR. P. CHALMERS MITCHELL ON LONGEVITY AND 



be remembered that the lower races of man are of lower viability 

 than the civilized races. None the less, existing results are so bad, 

 that drastic experiments would be justified. The simplest change 

 would be to allow them free access to the open air. 



Cercopithecid^. ?°;°^ .^"^-^'^r ^l^^-^\7; 



Incliv. m months, m months, 



Semnopithecus, whole genus 56 4* 3 15 



/S. entellus (LsiYigur) 20 46 13 



S. cephaloi^terus 24 3'6 15 



/S'. fasciatus 1 2 2 



S. maicrus ; 8 4 15 



/S. obscurus ■ 2 \'2-5 14 



aS'. hypoleiLcus 1 3 3 



Here again it is plain that the conditions are hostile, and that 

 these naonkeys have a low viabilitj^. In the natural condition 

 they feed chiefly on grain, and green leaves and shoots, and it is 

 probable that their diet in captivity is not suificientl)' bulky in 

 proportion to its nutritive value. But these monkeys have always 

 been treated as requiring warmth rather than fresh air. 



No. of Av. dur. Max. dur. 



Indiv. in months, in months. 



Colohus, various species, chiefly 



vellerosus 10 3"2 13 



The African Oolobus and Guereza monkeys resemble the Asiatic 

 Semnopitheci in structure and habits. They appear equally to 

 sufier from the conditions of captivity. 



No. of Av. dur. Max. dur. 



Indiv. in months. in months. 



CercojiMifAecKS,* whole genus . . 693 11*5 .122 



C.diana 42 13 45 



C. neglectus 1 40 40 



C.leucampyx 19 9 44 



C. nictitans 17 8 30 



C. martini 13 22 122 



C. labiatus 1 17 17 



C. stairsi 4 8 12 



C. albogula7'is 45 11 46 



C.grayi 6 12 41 



G.mona 28 17 65 



C.camphelli 27 12-9 76 



C. I'hoesti 1 44 44 



C.petaurista , 39 11 "7 66 



C. ascanias 2 7 11 



C schmidti 2 3 5 



C.cephus 37 17-7 65 



C . erythrotis 2 33-5 47 



* In this genus, I have followed as nearly as possible the synonj'my in Mr. K. I. 

 Pocock's revision, P. Z. S. 1907, p. 677. 



