62 The Ottawa Naturalist. [June 



being due to a very careful series of experiments which have been 

 carried on tor some years till the proper adjustment of materials 

 and the right degree of burning and subsequent reduction to an 

 almost impalpable powder has been reached. 



Ontario. 



Among the largest deposits of the marl, some of which have 



already been utilized on an extensive scale, may be mentioned the 



following localities : At Marlbank in the township of 



Localities ot r 



Marl deposits Hungcrford, on the line of the Bay of Quinte railway 

 the great works of the Deseronto Cement Co. are located. The raw 

 Marlbank material is derived from the beds of White and Dry 

 lakes, the deposit extending over several square miles and having 

 a depth in places ot at least 20 feet. Large works in connec- 

 tion with this company are also located at Strathcona, formerly 

 Napanee Mills, which is about five miles northwest of the town 

 of Napanee, the capacity of the plant being over 100,000 barrels 

 annually. 



Another very important deposit is situated in the bottom of 

 Shallow Lake, Keppel township, county of Grey, about nine 

 miles from Owen Sound on the west side of Georgian bay. The 

 property here comprises nearly 600 acres, the marl having a 

 thickness of trom one to six feet, with an average depth of four 

 feet, underlaid by clay with a thickness of two feet. 



Another large deposit is found in Williams lake in the 



township of Holland, in the same county, near the line of the Tor- 



onto, Grey and Bruce Ry., and also near Durham 



W 11113. Ills 1-j3.K0 



Grey Co. which is also convenient to railway communication. 



Marl also occurs on lots 25 and 26, ranges VII and VIII, 

 Flos township, Simcoe county, but the thickness and extent of 

 the deposit is not yet definitely known, though apparently quite 

 large. This area lies a short distance to the southeast of 

 Georgian bay. 



Large deposits of excellent marl are found in the 

 counties ot Peel and DufFerin. In the first-named county 

 Peeiand ^ deposit in the fourth and fifth concessions of 



Dufterin Co s ^ 



Caiedon the township of Caledon, in close proximity to the 



railway, is reported as covering about 350 acres with an average 



