48 
individuals of red olivine with large plates of brown mica. 
The melilite and perovskite lie in the finer grained ground- 
mass. An analysis of this rock is given on page 46, under 
No, xii: 
Microphotograph of alnoite. Point St. Charles, Montreal. The lath-shaped 
crystals are melilite showing peg structure. 
Another dyke of alnoite was laid bare on the river 
bottom near the approach to the Jubilee bridge at Point 
St. Charles when the water was very low in 1895. 
This is rather more than two feet wide and cuts a 
smaller fourchite dyke. It contains about 20 per cent. of 
melilite. A microphotograph of a thin section of this rock 
showing the melilite is on this page. An analysis of the 
rock is given under No. XII, page 46. 
Alnoite also occurs forming the paste of the igneous 
breccia on Ile Bizard, as well as in dykes cutting this breccia. 
In the latter the melilite often forms 25 per cent. of the rock 
