362 THE CANADIAN NATURALIST. [Vol. viii. 



continued to the micas of other rocks for want of time, have 

 yielded as striking and important results as those into the olivines, 

 augites and hornblendes ; and the theory of the derivation of the 

 ores from the country-rock has been proved for a number of lo- 

 calities. I have not yet been able to obtain mica from the neo- 

 volcanic rocks in sufficient quantity to detect the heavy metals 

 in them, in the same way as in augite and hornblende. 



G. Bischof, who is well qualified to express an opinion on the 

 mode of formation of metallic veins and also on chemical geology 

 in general, stated, in the year 1866, in regard to the relations 

 of silicates to the metallic veins: " However likely it maybe 

 that the metals of the sulphuretted ores are present as silicates 

 in the country-rock, it is not yet certain." This can no longer 

 be said, at least in the cases described above. 



REVIEW. 



The Antelope and Deer of America ; by John Dean 

 Caton, LL. D. ; 8vo., 426 pp.; numerous cuts. New York (Hurd 

 & Houghton). This valuable work has evidently been prepared 

 with care by one who has devoted a great deal of time and study 

 to our Antelopes and Deer. Mr. Caton has kept the American 

 Antelope and several species of Deer in domestication for many 

 years, and had the best of opportunities for observing their 

 habits. His work contains many illustrations, and will, we are 

 sure, be welcomed by both naturalists and sportsmen. 



