OF CANADIAN FOSSIL FUELS. 45 



(16.) From a microscopic examination of thin slices of tliis coal it was inferred tliat tlie nodular grains consist 

 of an altered resinous matter. 



(17.) The specimen of semi-anthracite No. G9 came from tlie Cascade mine (^Moberly's), which is near Banff 

 Station, on the Canadian Pacific Raihvaj'. Tlie Hughes' mine (Stewart's mine) here referred to, is about three 

 miles di.stant from that mine. 



(18.) Determination of the specific gravity. The fuel was reduced to the state of a coarse powder by crushing 

 it in an iron mortar, the application of more force than was absolutely neceseary to efTect this being carefully 

 avoided, so as to obviate, as far as possible, the production of fine particles and dust. Tlie material was subse- 

 quently freed from the latter by slinking it upon a sieve of ninety holes to the linear inch. The specimen having 

 been introduced into the S|JOcific gravity bottle, and suilicient water added to thoroughly immerse it, the whole 

 was placed under the receiver of an air-pump, and exhaustion very gradually proceeded with; the exhaustion was 

 repeated at intervals, and until no more bubbles were seen to come off. The bottle was then removed, and the 

 necei-sary adjustments having been made, weighed ; after which, a portion of the water having been withdrawn, it 

 was again placed under the receiver of the air-pump, etc. 



