184 
Na, 00 450 
Ho D MKO Na,0 
Zig: 
blunt extremity. They are faintly double-refractive. Amorphous 
particles could not be ascertained. The erystals which had formed 
in the experiments N° 8—18 were likewise microscopically examined ; 
they appeared entirely to correspond with those obtained in the 
above-mentioned manner. 
A specimen of the crystals treated with alcohol of 96 °/, showed 
a complete change. A superficial examination already teaches us in 
this case, that under the influence of the alcohol the crystals 
gradually disappear, while amorphous particles precipitate from the 
liquid. Microscopically too it appears that in these circumstances the 
crystals cannot exist, but separate out amorphous particles ZnO (or 
Zn(OH),): Even alcohol of 96°/, has a hydrolyzing influence on the 
zincate, and it is not surprising that the above-mentioned inves- 
tigators obtained products of an improbable composition. Proportional 
to the quantity of the alcohol and the duration of the operation, a 
