Composition of Limestones and Dolomites. 27 



Arnica Parryi, Gray. 



Collected first at Kicking Horse Lake in the Rocky 

 Mountains by Prof. Macoun in 1885, but referred to A* 

 foliosa. Again collected at the same place in 1890, and 

 correctly determined and afterwards in 1891 at Lake Agnes 

 and Lake Louise near Laggan, Eocky Mountains. New 

 to Canada. 



Hemicarpha subsquarrosa, Nees. 



This minute sedge was found in 1891 by Prof. Macoun 

 growing in damp sandy soil near Amherstburg, Ont. New 

 to Canada. 



The Composition of Limestones and Dolomites 



from a Number of G-eological Horizons 



in Canada. 



By B. J. Harrington, B.A., Ph. D. 

 The following analyses of limestones and 'dolomites from 

 various localities in Canada have been brought together in 

 the hope that they may be of interest to students of geology 

 or of value for technical purposes. Some of them have 

 appeared in previous papers or reports by the writer, but 

 others are now published for the first time. In some cases 

 they are incomplete, the main object as a rule having been 

 to ascertain the proportions of calcium and magnesium car- 

 bonates. They are arranged in the order of the geological 

 formations from which they are supposed to have been 

 derived. 



Cambrian ? 



1. From about six miles above Yale on the Fraser River, 

 British Columbia. The limestone at this locality is white 

 and crystalline, and occurs interstratified with grey gneiss. 

 A specimen collected by the writer was found to contain : 



Calcium carbonate 91.55 



Magnesium " 1.43 



Ferrous " 0.16 



Alumina 0.27 



Insoluble matter 5.62 



99.03 



