126 DONALDSON. fVorL. EX 
The hemiencephalon was suspended by a thread in the 
middle of a jar of hardening fluid, and the jar was closed with 
a cover. 
In the case of the bichromate of potash solution, the harden- 
ing was, as a rule, conducted in the dark, and at the ordinary 
temperature of the room, z. ¢., 18—22° C. 
_ The solutions of bichromate of potash were all made by 
adding the salt to the full measure of water. 
For example, a 2% solution represented 2 grms. of the salt 
added to 100 c.c. of water. 
The instance with which we shall begin was the follow- 
ing :— 
January 16, 1890. The hemiencephalon of a sheep was 
found to weigh 59.8 grms. 
This was placed, in the manner above described, in a jar 
containing 500 c.c. of 2}% solution of bichromate of potash 
in tap water. The specimen was then weighed at the intervals 
indicated in the subjoined table. 
TLABLE “1, 
Showing the change in the weight of the hemiencephalon of a sheep when 
subjected to the action of 2%% solution of bichromate of potash for 685 days : — 
Time tn Days. PERCENTAGE GAIN, 
1.0 17.8 
2D 26.2 
3-9 31-4 
5:9 34-2 
12.9 36.2 
03.0 37-1 
550.0 37.1 
638.0 39-0 
685.0 38.0 
The increase in weight which was found is given in the 
column of percentages, these percentages being based on the 
weight of the fresh specimen as noted above. 
The examination of Table 1 shows that this specimen 
increased greatly in weight — that this increase was very 
rapid during the first day (24 hours), still active during the 
next five days, amounting at the end of the sixth day to 
