282 
ANATOMY: H. H. DONALDSON 
PERCENTAGE OF WATER 
I AGE IN DAYS ] 68 
0 20 40 60 80 100 130 160 200 240 280 320 360 
CHART 2 
Showing on the upper graph the percentage of water in the brain of the albino rat from 
birth to 365 days. The four heavy dots represent the observation for man entered at equiva- 
lent ages. The graph for the percentage of water in the spinal cord is not discussed. 
ALBINO RAT 
TH! 
ESS 
OF C 
ORT 
EX. 
H 
U A 
■ i ■ rv. 
s 
> 
4 
b^— - 
//jf / 
' / 
■' / 
BR/ 
VIN WEIG 
HT 
.Ql 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10 11 12 13 14 i.5 16 17 18 1.9 20 ^ 
CHART 3 
From Sugita '17, chart 9. Giving in millimeters the corrected thickness of the cerebral 
cortex of the albino rat; H, in the horizontal section; S, in the sagittal section; F, in the frontal 
section; A, the heavy line, represents the average of all of the measurements. The two 
heavy dots represent two incidental values for the human cortex — after reduction — entered 
at the equivalent ages. 
