BRAIN-WEIGHTS OF ANIMALS WITH SPECIAL REF- 
ERENCE TO THE WEIGHT OF THE BRAIN IN 
THE MACAQUE MONKEY. 
By Epwarp ANTHONY SpitTzKa, M. D., 
Alumni Association Fellow in Anatomy, Columbia University. 
(From the Anatomical Laboratory, Columbia.) 
The accumulation of considerable material for morphologi- 
cal study during a period of over ten years has furnished a 
series of brain-weights whose publication as a contribution to 
. the subject from a comparative standpoint seems desirable.* 
All the animals whose brain-weights are here given were 
Mammals (204 in number), the great majority belonging to the 
Quadrumana, among them being 80 of the genus Macacus. Of 
the total number, 192 brains were weighed in the fresh state, 
the remaining 12 after the body had been injected with a zinc 
chlorid solution. The latter series is tabulated separately. 
The weights are expressed in grammes. In all cases the brain 
was severed from the spinal cord at the foramen magnum and 
weighed with its pialinvestment. In nearly all cases the body- 
weight was also recorded, giving the relative as well as the ab- 
solute brain-weight. In this connection it must be noted that 
many of the animals, particularly among the Quadrumana, were 
quite young, giving ratios of body and brain-weight not gener- 
ally applicable to the adult animal. Thus, among the gyren- 
1 The writer is indebted to Professor GEORGE S. HUNTINGTON for the 
privilege of compiling these data. 
