﻿458 Canadian Record of Science. 



though numerous specimens were taken from localities where these 

 precious metals were supposed to exist, but careful assays gave a nega- 

 tive result. 



This report with the elaborate map, the general description of 

 the country and rocks, the plates which illustrate in an admirable 

 manner typical natural features and microscopic rock structure, and 

 the amount of petrographical research contained therein, marks a 

 great advance in the work on the Canadian Laurentian. 



0. E. LeRoy. 



