TWENTY-FOURTH ORDINARY MEETING. 297 
accompanied by a very crystalline and distinctly spotted or mottled 
diorite in which the hornblende is dark green or black, and the 
felspar white, grey or reddish. A dull red, rather fine-grained 
gneiss, streaked and spotted with dark grey or black, is found in 
proximity to the apatite deposits in some parts of Ottawa county. 
Interstratifying the gneiss near a number of the apatite deposits in 
the valley of the Liévre, I have noticed thin seams and also beds, up 
to several feet in thickness, of a quartz-rock which is white or light 
bluish in color, semi-translucent, non-crystalline or compact, pitted 
or honeycombed on weathered surfaces, the cavities being apparently 
due to the dissolving away of felspar. 
It is well known that some of the metals exhibit a preference, 
locally at all events, for certain rocks which, as the miners say, are 
“kindly ” to them ; as for example (among the old crystalline rocks), 
oxides of iron with hornblende schists, galena with limestone, sul- 
phides of copper with greenstone and talcoid schists, gold with 
quartz, tin with granite, etc. There is thus nothing extraordinary 
in the, association of the apatite of the Laurentian system with 
pyroxenite. 
We have seen that, in regard to the apatite of Ottawa county at 
any rate, there are certain pretty well ascertained geological and 
mineralogical associations, so that should we find these conditions 
repeated in another region, among the widely-spread Laurentian 
rocks of Canada, we may look with some confidence for apatite. 
These conditions may be briefly recapitulated as follows : a somewhat 
regular large-scale structural arrangement of the gneiss in bands, 
having distinctive characters and accompanied by limestones, a con- 
siderable number of ‘the Laurentian minerals,” and the presence 
of pyroxenite or of mottled diorite. For these reasons I have ven- 
tured to predict the probable discovery of apatite in the Parry Sound 
district ever since 1876, when I made a geological reconnoisance of 
the district and found five distinct limestone bands, of which the 
general positions and courses were indicated, and to which I gave 
separate names —(See Geol. Survey, Report of Progress, 1876-77, 
pages 202-208). The general structure and character of the Lauren- 
tian rocks to the north-eastward of the Georgian Bay would place 
them among the higher divisions of the system. In this region I 
also found the mottled diorites and the pyroxenites which, in the 
county of Ottawa, indicate the proximity of apatite. A considerable 
