114 
road. This rock has been thoroughly cemented, quartz 
being deposited around, and in crystalline continuity 
with the original grains of sand. 
Opposite Farmer’s cottage the granitic gneiss of the 
district is intruded by tourmaline pegmatite, rich in tour- 
maline. The feldspar of the rock is microcline, and in 
thin section the tourmaline is brown and shows zones of 
colouring. North of the road at this point, and distant 
about 200 yards (183 m.) from it, is a gneiss very rich 
in pink garnet. 
The extensive intrusion of pegmatite veins to which 
the Pre-Cambrian gneisses have been subjected is illustrated 
near the ferry by a few patches of granite-gneiss which 
outcrop through the Leda clay. 
BIBLIOGRAPHY. 
Mica. 
1. Harrington, B.J. Rep. of Prog., G.S.C., 1887283; 
leita (Ge 
2.) Osan oN. Ann. Rep., G.S.C., Vol. XTIRANES? 
ee Oy 
3. (Elis Re W. G.S.C. Bulletin on Mica, 1904, 
No. 869. 
4. Cirkel, F. Rep. Mines Branch, Dept. of 
Mines, Can., No. 10, 1905. 
5. de Schmid, H.S. Rep. Mines Branch, Dept. of 
Mines, Canada, No. 118. 
Apatite. 
6. Dawson;- J. W. ©.).G:S5.1876; 
7. Torrance, J. F. Rep. of Prog., G.S.C., mgé2=45 
Part J. 
8. Ells, R. W. G.S.C., Bulletin on Apatite, 1904, 
No. 881. 
