298 PROCEEDINGS OF THE CANADIAN INSTITUTE. 
number of. the mineral species which usually accompany the Lauren- 
tian limestones was also found. 
In the county of Ottawa the most productive “phosphate belt ” 
as yet known runs northerly and follows the general course of the 
Riviére du Jiévre. It has been traced through the townships of 
Templeton and Buckingham, Portland, Bowman, Bigelow and Wells, 
and I have been credibly informed that the mineral has been found 
in places in this direction to a distance of 100 miles from the Ottawa. 
In the Perth and Kingston region, the phosphate belt runs from the 
township of North Elmsley south-westward through North Burgess, 
North Crosby, Bedford, Storrington and into Loughborough. 
There is little doubt that the apatite has been derived prineipally 
from the pyroxene rocks. Phosphate of lime in small quantities is 
a common constituent of igneous rocks. Dr. Harrington has shown 
that the trappean rocks of the isolated mountains in the Province of 
Quebec contain it in very appreciable quantities, and it has been 
met with in the amygdaloids of the Bay of Chaleur. I have found 
bunches and crystals of apatite associated with amygdaloid and syenitic 
granite at Trout Lake at the source of one of the branches of the 
Moose River. There is no evidence whatever that the Laurentian 
apatite has had the remotest connection with organic life, although 
it is a rather curious circumstance that the average proportion of 
fluorine in this anciently formed mineral should approximate that 
contained in the bones of mammals. 
The pyroxenite appears to take the form of irregular beds and al- 
most isolated masses running with the stratification, but these have 
been altered in shape and partially dispersed during the metamor- 
phism of the whole mass containing them. They have probably 
been originally derived from igneous sources and have perhaps 
formed parts of submarine ejections while these ancient rocks were 
in the course of deposition ; or they may have been intruded subse- 
quently. They have since all undergone great alteration and distur 
bance, in the course of which they have been in a heated and some- 
what plastic state and have become more or less mingled with one 
another. It was at this remote period that the irregular and some- 
what ill-defined veins of the second and third class described by Dr. 
Hunt as belonging to such rocks were formed—(Geol. Survey, Report 
of Progress, 1863-66, p. 187). These veins are very numerous among 
all the Laurentian rocks. They are filled with the prevailing consti- 
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