164 DONALDSON. [VoL. IX. 
If from the foregoing we tabulate the subdivisions of the 
human brain according to the degree to which they changed in 
weight, it is as follows :—The subdivision which changed 
most is marked 1; that which changed least, 3. 
TABLE 47. 
ORDER OF CHANGE IN WEIGHT. 
BRAIN. SOLUTION. ye een erate 
ERE- iS 
BELLUM. SEA. ates, 
Xx == 24% bichromate of potash . . . I 3 2 
Ill = 24% bichromate of potash plus 1%, 
sodium sulphate... . « . I 2 3 
XIII = 8% bichromate of potash . . . 2 I 3 
IX = 24%, bichromate of potash plus 4% 
coppermsulphate even nes iene I 2 B 
II 96% alcohol (decrease)... « 33 i | 2 
It must always be remembered that in the case of the human 
brain, there is one more condition than in that of the sheep. 
For while these latter are killed when in full health, the human 
subjects die after more or less prolonged illness, and it has yet 
to be demonstrated, that the various forms of disease are with- 
out influence on this reaction. It remains to be shown how 
the sheep’s brains will react when tested in this same way. 
As might be expected, the brains of the newborn react less 
vigorously to these reagents. 
TABLE 48. 
Entire encephala of new-born males. Change after 30 days in the hardening 
solution. 
BRAIN. SOLUTION. PERCENTAGE CHANGE. 
I 2% Bichromate of Potash 26.0 
2 24%% Bichromate of Potash + 10.6 
3 91% Alcohol — 13.0 
In young individuals, both the supporting tissues and the 
medullary substances are less developed than in the adult, and 
