elxxxiv Proceedings of the Asiatic Society of Bengal. [N.S., XV, 
loss of magnesia. Taking the simplest cases, the equations 
would be— 
3Mg,Si0, + SiO, + 4H,0=2H Mg,8i.0, | 
and 2Mg SiO, + CO, + 2H,0 =H,Mg,Si,0, + MeCO.. 
action of siliceous waters, for along a considerable portion of 
their margins, the peridotite massifs have been replaced by 
in the Mysore district, where bands and lenses 
Although it is now generally recognised that chromite 
deposits must be regarded as primary segregations from ultra- 
etre Mer eG do one peeks 
1 P. Sampat Iyengar: Records, Mysore Geol. Dept., Vol. VII, pt. 2, 
Pp. 38 and 39. 
2W. F. Smeeth and P. Sampat Iyengar; Mineral Resources of 
Mysore, p. 111. 
