412 
HYDROPHANE. 
of Turin. Saussure has mentioned this last place, 
in his Travels, as producing the hydrophane, and 
tells us that the mountain is composed of a green 
serpentine, harder than that of Saxony. Beneath 
the beds of serpentine are masses of a green mag- 
nesian earth, which seem to be nothing more than 
the serpentine stone in a decomposed state. In 
these masses are found a number of rolling stones 
something larger than a cricket-ball, and among 
them are the hydrophanes, though scarcely one of 
these is to be met with among a hundred of the 
others. 
