PETROLOGICAL ABSTRACTS AND REVIEWS 189 
On Mount Rougemont an anorthite-olivine-gabbro occurs. It con- 
sists by volume of anorthite 52 per cent, augite 32.5 per cent, olivine 
8.5 per cent, iron ore 6.5 per cent, hornblende 0.5 per cent. For this 
rock the name rougemontite is proposed. 
The author suggests the probability that the Monteregian region 
may be part of a larger province, and the rocks may be related to the 
anorthosites. 
Numerous analyses and recalculations into the C.I.P.W. system, 
as well as volumetric determinations by the Rosiwal method, are given. 
