10 JOURNAL OF COMPARATIVE NEUROLOGY. 
cephalic Mammals, we find such ratios as 1:17 for a young 
Chimpanzee, and 1:20 for a young Coati-mundi. Of course, 
such cases can not be taken as standards any more than they 
can in the human species, where the new-born babe, with a 
ratio of 1:8 has relatively five times as heavy a brain as an 
adult man. Furthermore it must be remembered that in the 
accession of such material as is comprised in this collection, 
most animals arrive in a poorly-nourished, half-starved condi- 
tion, or they have died as the result of wasting diseases; in. 
either case losing considerable body-weight and materially de- 
tracting from the value of any computations of any brain- and. 
body-weight ratios. It is fortunate that the brain attains to: 
nearly its largest size so early in life, and that its weight is so 
slightly affected by starvation and disease, and it is for this 
reason that the writer ventures to subject the large series of 
brain-weights of the Macaque monkeys to a special analysis. 
However, since the body-weight alone as a criterion or as a 
means of comparison is inadequate, it is our purpose hereafter 
to record as well the bodily dimensions, such as the length from: 
vertex to heel, or to the root of the tail, and particularly mea- 
surements of the head. 
The list of brain-weights, with the sex, body-weight, and 
ratio (the brain-weight is considered as equivalent to 1), 
follows : 
