1285 
N°’. 4. (‘‘a. Borneo. Reinwardt’). Female skeleton. Basal length 
of skull 169 mm. Breadth across the zygomata 150 mm. Length of 
the skeleton from alveolar point to caudal basis 89 cm. (measured 
along the back). Somewhat below middle age, the cranial sutures 
only commencing to obliterate. Capacity 278 em’. 
N°. 5. (“907”). Balik Papan, Borneo. Female skull. With skeleton, 
allowing to measure the length of the skeleton (along the back) 
from alvesolar point to caudal basis, 109 em. Full-grown and middle- 
aged, according to skeleton and skull. Basal length 199 mm. Breadth 
across the zygomata 167 mm. Capacity 341 cm’*.’). 
I determined the cranial capacity of a young female béruwang, 
whose teeth, with the exception of the canini, had all erupted, and 
which weighed 12 kilograms according to my estimation, when 
kept in captivity in its native country at Bua in Sumatra for some 
time, at 305 cm’. 
l find 325 cm? for the capacity of a large male tiger, killed there, 
the same value as for that of the female bear N°. 3 from Borneo, 
with probably four times greater body weight. The skull of a female 
orang utan of this island has a capacity of 380 cm*. The animal 
probably weighed as much as a large Bornean bear with the same 
cranial capacity. 
With these data about brain weights and body weights, and 
longitudinal dimensions of body and skeleton, determined directly, 
and with the brain weights calculated by means of CokNeEvIN’s 
comparisons”) I find that- the cephalisation-coefficient of Ursus 
malayanus may be put at least at0.75, equal with that of the 
Anthropoid Apes. 
The relation between the muscular power (which is determined 
by the cross-section of the muscles) and the rapidity of motion 
which depends on it, and the quantity of brain manifests itself in 
a very striking way in American Monkeys. The Howlers (Mycetes) 
have much less brains in proportion to the size of their bodies than 
1) No. 4 and 5 were not mentioned in the Dutch version of this communication. 
Accordingly the coefficient of cephalisation of Ursus malayanus found here is 
somewhat different from that in the Verslagen. 
4) Cu. Cornevin, Examen comparé de la capacité cranienne dans les diverses 
races des espéces domestiques. Journal de Médecine vétérinaire et de Zootechnie 
publié al’Ecole de Lyon, 3me Série, Tome 14, p.8-31 and Etude sur le poids de l’encéphale 
dans les diverses races des espèces domestiques. p. 248—262. — Irom his 
recorded values | calculate 88°/, brain weight for capacities of a mean of 650, 
and 93 °/, brain weight for an average capacity of 100 and less, say 91 °/) for 
the capacities mentioned above. 
