324 FRANK D. ADAMS 
bluish-green color and a marked pleochroism. It has a small 
axial angle, and resembles in general character the variety rich in 
ferrous iron and alkalis described from the nepheline syenites 
of Dungannon, Ontario, under the name of Hlastingsite. 
The feldspars resemble those of the other specimen, but 
there is proportionally more microperthite and a considerable 
amount of an acid plagioclase. Fluor spar is also present, in 
not inconsiderable amount, in the form of large, colorless grains. 
The structure is the same as that of the former specimen, 
the feldspars being idiomorphic, and the dark constituents 
occupying the spaces between the feldspar laths. 
The specimens, therefore, while not actually containing any 
nepheline, have the character of certain differentiation products 
of alkali-rich magmas, which are found associated with nepheline 
- syenites and other nepheline-bearing rocks in other parts of the 
world. . 
In the Report of the Geological Survey of Canada for 1846-7, 
Sir William Logan, after describing certain ‘‘traps”’ of this same 
district, refers to what is apparently the same occurrence, as 
follows: 
“The rock above and below is composed of brownish feld- 
spar and black hornblende... . it is large-grained, and the 
general mass of the country constituting the Old Pic Point and 
Island appears to be composed of it. Fluor spar occurs as a 
disseminated mineral in some of the beds. Judging from frag- 
ments on the shore, there are some beds composed of white 
feldspar and occasional groups of orange red grains of elaeolite, 
the whole studded with brilliant black crystals of hornblende, 
forming a very beautiful rock. The general mass of these vol- 
canic overflows weathers to a red, and from a distance may be 
readily mistaken for the gneiss which underlies the chloritic 
shales.” 
Although the rocks in question are here classed as belong- 
ing to the traps of the district, in the Geology of Canada pub- 
lished by the Geological Survey of Canada in 1863, they are, in 
a reproduction of the passage quoted above, referred to simply 
