1278 
1408 em.’ Broca (i.e. 1320 cm.’ real capacity) from the comparison 
of the greatest length and breadth and a corresponding height of 
the endocranial plaster casts of the Neandertal calvaria and the 
een 
Fig. 1. Median cross section of a skull of 
Hylobates agilis. °%/3 natural size. 
Le aca 
Fig. 2. Median cross-section of the skull of Hylobates 
(Symphalangus) syndactylus. */s nat. size. 
La Chapelle skull in relation to its capacity. In this the relatively 
more considerable breadth of the Neandertal calvaria in the frontal 
region was not taken into account. Perhaps some measure did not 
exactly correspond. Assuming similarity of form, the capacity as 
computed from the relation of the calvarial heights of these skulls, 
is 1450 cm’. On the strength of these and of the foregoing consi- 
derations it seems to me that an estimation of the capacity of the 
entire Neandertal-skull at 1400 cm’. at least cannot be far from 
the truth. That of Spy I can have been but little smaller, and Spy 
II must, in the same ratio, have reached a true capacity of 1600 
cm’. By the method of the “cubic index” J. Fraipont had calculated 
for Spy I 1562 em°. Broca-capacity (which corresponds to 1470 cm’. 
real volume), for Spy Il 1723 cm’. Broca (i.e. 1620 cm’. real volume), 
