134 DONALDSON. [Vou. 1x 
Conversely, if the increase in weight is due to the absorption 
of the solution, the amount of solids in the hardened specimen 
should be equal to that in the fresh specimen plus the salts 
dissolved in the amount of the hardening fluid which has been 
absorbed. 
Percentages of Water and Solids tn the fresh Hemiencephalon 
of Sheep. — The average of ten specimens dried to a constant 
weight at 95° C. gives the solids in the sheep’s brain as 20.5% 
of the fresh weight. The variation is from 19.4% to 21.2%, 
or 1.8%. 
Thus far it has not been possible to bring the variations into 
relation with any other variable. 
A similar determination was made for encephala which had 
been acted upon by 2% bichromate of potash for from 45 to 
57 days. 
The average percentage of solids was found to be 20.9% of 
the fresh weight for those hardened 45 days, and 21.9% for 
those hardened for 57 days. 
(EABLE (6, 
Fresit Weron or | Paxcentace [Ensen Wacnt oF | S "car, bicuwosar® oF Porastt. 
In GRMS. FresH BRAIN. IN GRMs. (sont DOH GESe eee 
60.4 20.0 50.7 21.9 
59-0 21.2 49.6 2 
55:8 20.2 49.0 20. 
52-9 20.6 47-5 20.3 
52.9 20.7 60.3 21.4 
52-9 20.2 60.2 2200 
52-5 20.6 59-4 22.0 
SE 19-4 54:5 21.7 
48.6 20.1 51.2 22.4 
40.0 21.0 
i 
ia = After 57 
Average = 20.51 After 45 days = 20.9 Saye one 
Since the variation is about the same in amount in both the 
fresh and hardened specimens, and the average is raised 0.4% 
and 1.4% respectively in the hardened specimens as compared 
