378 APPENDIX. No. IV. 



ture, composed of quartz and red felspar, coarse 

 grained. 



y. Syenite, composed of honey-yellow felspar and 

 hornblende, in very large crystals, the felspar passing 

 into red and pink, and the whole rock mass penetrated 

 by veins of the same material, but fine grained. This 

 variety of igneous rock was met with principally at 

 Pemmican Rock, western inlet of Bellot's Straits. 

 Large quantities of hornblende are also met with at 

 Leveque Harbour, Bellot's Straits, composed of facetted 

 crystals agglutinated together into large. masses, forming 

 a crystalline hornblendic gneiss. 



10. Pond's Bay, Baffin's Bay, lat. 72° 40' N.— In 

 this locality a quartziferous black mica schist underlies 

 the Silurian limestone, and is interstratified with gneiss 

 and garnetiferous quartz rock, all in beds, inclined 

 38° W.S.W. (true). 



11. Montreal Island, mouth of the Fish Eiver, lat. 

 67° 45' N. — The granitoid rocks, which everywhere, in 

 the Arctic Arcliipelago, underlie the Silurian limestone, 

 appear at Montreal Island as a gneiss, composed of bands 

 of felspar (pink) and quartz {I inch thick), separated 

 by thin plates composed altogether of black mica ; the 

 whole rock exhibiting the phenomena of foliation in a 

 marked degree. 



The east side of King William's Island, though com- 

 posed of Silurian limestone Hke the rest of the island, 

 is strewed with boulders of black and red micaceous 

 gneiss, like that of Montreal Island, and black meta- 

 morphic clay slate, in which the crystals of mica (qu. 

 OttreKte) are just commencing to be developed. It is 

 probable that the granitoid rocks appear at the surface 

 somewhat to the eastward of this locality. 



12. Frinee of Wales' Island, west of Peel Sound. — 

 The granitoid rocks extend across Peel Sound into 

 Prince of Wales' Island, in the form of a dark syenite, 

 composed of quartz, greenish white felspar passing into 



