15 
excellently foliated, owing to the finely granulated material, 
which results from the breaking up of each large individual, 
arranging itself in the shape of a very flat lens about the 
crystals remnant from which it was derived. This lens, 
of course, lies in a plane at right angles to the pressure, 
and in section appears as a long slender tail of broken 
grains extending from the remnant in either direction. 
The pyroxenes, rhombic or monoclinic, when present 
in the rock, undergo a precisely similar process of granula- 
tion with the formation of similar tails of broken grains. 
A very remarkable fact in this connection is that 
the large crystal fragments of plagioclase have a deep 
violet colour, while the granulated plagioclase is white. 
This contrast is excellently seen either on the weathered 
surface or when a thin section is placed ona sheet of white 
paper, and is due to the fact that the minute dark-coloured 
or black inclusions, which abound in the large individuals. 
are absent in the broken material. They seem to have 
aggregated themselves together into little grains of 
titanic iron ore, which occur in the granulated plagioclase, 
but which are absent in the large individuals. So dis- 
tinctive is this contrast of colour, that when a thin section 
containing plagioclase in both forms is placed under the 
microscope, it is possible at once to predict from the colour 
alone, just what portions will show granulation and what 
portions will not, before the actual structure has been 
revealed by the agency of polarized light. This might 
seem at first sight to indicate a recrystallization in the 
case of the granulated portions of the plagioclase, but 
the facts do not seem to support this supposition. At any 
rate the feldspar does not alter in composition during 
the process of granulation, but merely breaks, and becomes 
lighter in colour through the loss of the dark inclusions. 
In the Morin anorthosite, the most granulated varieties 
are found near the sides of the intrusion, especially on the 
east side, as if the pressure had been exerted from that 
direction, but more or less distinct evidences of granulation 
can be seen throughout the entire area. The white granu- 
lated anorthosite forms the greater part of the arm-like 
extension of the Morin mass, protruding through the 
drift in all directions in the form of hundreds of smooth 
white hummocks and giving a striking appearance to the 
landscape, as, for instance, about the village of New 
Glasgow. Further, it can be observed that everywhere 
