NO. 1s] HARDENING REAGENTS. 153 
TABLE 28. 
PERCENTAGE CHANGE CONDITION OF 
SOLUTION. 
AFTER 2 Days. SPECIMEN. 
Mercuric Chloride 1: 10,000. + 48.7% Very soft. 
Tap Water. 0a Soft. 
Alcohol 50%. + 3.8% 
Air at 20° C. =" 0.9% 
Sodium Chloride. Sat. Solution in Water. =. O7y Soft. 
} vol. 95% Alcohol, } vol. Glycerine. — 25.045 Hard. 
TABLE 29. 
A series of hemicerebra were subjected to the conditions below indicated : 
PERCENTAGE CHANGE. 
SoLuTION. so (hide ra 
AFTER ae aS CoNDITION 
3 Days. i f a 2 OF SPECIMEN. 
5% Sugar Solution in Water. slo) L045 Soft and Pink. 
oy “ “oo «6 +207, |—14 Mouldy. 
5% Tartaric Acid “ “ (2 days). + 14.0% 
Ivol. 4% Bichromate of Potash. } R. Hy 5 22% = 
1 * 95% Alcohol. GAS Rem 9/7 ek 
5% Potassium Tartarte. — 1.4% |+ 47 Very Soft. 
5% Sodium Sulphate. — 7.8% Soft and Pink. 
5% Zinc Chloride Solution in Water. — 9.0% a ko 
rr —170%| — |-3¢ 
The specimens in Table 29 were hemicerebra only, and hence 
differed slightly from those in Table 28. The difference does 
not in all probability affect the general results. 
Special attention is called in Table 29 to the action of the 
solution containing equal volumes of 4% bichromate of potash 
and of 95% alcohol, since the final change in the specimen is 
slight. Judging from the figures above given, 50% alcohol, a 
saturated solution of sodium chloride, as well as the bichromate 
of potash and alcohol mixture just mentioned, disturb the 
normal weight but slightly. We come, finally, to the reaction 
which follows the treatment with two successive fluids. After 
ample hardening in bichromate of potash, alcohol produces 
more or less loss of weight. 
