218 Canadian Record of Science. 



nature of true veins than of beds. Dr. Penrose l also shows 

 that the mineral occurs almost without exception in associ- 

 ation with pyroxenic or hornblendic rock, especially in the 

 Quebec district, where he says "the phosphate has never 

 yet been found without being associated with pyroxene rock 

 and possibly often of vein origin." He also states that "the 

 pyroxene is never found distinctly bedded, though occasion- 

 ally a series of parallel lines can be traced through it, which 

 while possibly the remains of strati tication are probably 

 often joint planes ; and sometimes when the pyroxene has 

 been weathered, apparent signs of bedding are brought out, 

 which are often parallel with the bedding of the country 

 rock." 



Sufficient has probably been said to warrant the opinion 

 that the pyroxenes are as truly intrusive in their character 

 as many of the other rock masses such as syenites, diorites, 

 &c, which are found so abundantly throughout the great 

 Laurentian area. So strongly impressed was the writer by 

 the study of the relations of the several rock formations as 

 presented in the mining districts of -Buckingham, Temple- 

 ton, &c, that in 1892, a number of the most interesting oc- 

 currences were carefully photographed under the direction 

 of Mr. 11. N. Topley, and subsequently colored to clearly 

 represent the different rock masses. 



In this way the contrast between the generally pinkish 

 or greyish banded gneiss, and the green massive pyroxene 

 wa& beautifully shown and the abrupt contact of the two 

 well brought out. It may be said that these colored views 

 were exhibited by the Geol. Survey Dept. at the World's 

 Fair, in Chicago, where they were greatly admired by those 

 interested in this branch of geological work ; the evidence 

 thus presented being held to be most conclusive as to the 

 intrusive character of the apatite bearing rock. 



Among places in the Lievre district where these contacts 

 can be especially well studied may be mentioned the mines 

 of the Philadelphia Company, the North Star, the Lon- 

 don and the Little Eapids mines on the eastern side of the 



1 gee Bulletin of the U. S. Geol. Survey, 1838. 



