16 
in this arm-like extension and in almost all its occurrences 
elsewhere, this white granulated anorthosite is more or 
less distinctly foliated, cwing to the arrangement of the 
bisilicates and iron ores in more or less distinctly parallel 
lines or streaks. It is often quite evident that these are 
nothing more than the rounded patches, rich in bisilicates, 
described for the massive anorthosite and which, owing 
to a movement in the rock, have been drawn out in one 
direction. The irregular- shaped patches, differing greatly 
in size of grain, that have been described as occuring in 
the massive rock, are also represented here by elongated 
streaks of similar character. This foliation is best seen 
where bisilicates and iron ore are comparatively abundant. 
When, as is sometimes the case, the rock is almost free 
from these constituents and all the plagioclase fragments 
have been destroyed, it assumes a nearly uniform granular 
character, and no trace of foliation can be observed. Along 
- the western border of the arm, the strike is exceedingly 
regular and remarkably well developed, as at New Glasgow, 
but is especially well seen along the same contact further 
north on range XI of the township of Rawdon, on the 
road between the villages of Chertsey and Rawdon. At 
this latter locality the rock has a remarkably regular 
schistose structure, due to the alternation of thin layers 
of pure plagioclase with still thinner ones of pyroxene. 
The pyroxene bands might more properly be called leaves, 
as they are very thin, being frequently represented by 
mere parallel lines in transverse sections. When examined 
under the microscope, in thin sections or weathered 
surfaces, both they and the plagioclase layers are found 
to contain small cores or remnants of large individuals 
with tails of grains extending from them in either direction 
as before described. These give rise to the perfect foliation 
and the progress of granulation is seen in an astonishingly 
perfect manner, the cores being in the very act of breaking 
up. 
The question of the origin of the several structures 
described next presents itself. There is every reason to 
believe that those structures which have been described 
as occurring in the massive anorthosite, namely, the 
irregularity in size of grain and the more or less irregular 
distribution of the several constituents through the rock, 
are original structures. These irregularities, frequently 
seen in intrusive rocks, are certainly not the results of 
