Reviews and Notices of BooJcs, 327 



contents, referring the reader to the publication itself, wliich has 

 been very properly placed in the book-stores for sale. 



First, we have the continuation of Sir W. E. Logan's exploration 

 of the beds of Laurentian limestone ; from which it appears that 

 four important bands of crystalline limestone have now been 

 traced for considerable distances through this contorted and 

 altered series of strata. The aggregate thickness of all these 

 limestones appears to be no less than 4000 feet, and so far no 

 certain indications of fossils have been discovered in them.* 



Another portion of Sir William's Report, very valuable at pre- 

 sent, is a summary of the latest facts relative to the metalliferous 

 deposits of Canada, and especially the copper deposits of the 

 Eastern Townships. This part of the Report, as well as the tabular 

 view of the localities in the Appendix, should be studied by every 

 one interested in these deposits. 



Mr. Murray's portion of the Report, more fully unravels the 

 intricacies of another cupriferous region, that of Georgian Bay. 

 Mr. Richardson describes the relations of the deposits in the 

 peninsula of Gaspe and the neighbouring shores of the St. Law- 

 rence. Mr. Sterry Hunt contributes a series of examinations of 

 the mineral and chemical constituents of the igneous and altered 

 rocks which penetrate the Silurian series in Lower Canada, and 

 form the mountains of Montreal, Bel ceil, Rougemont, Mount John- 

 son, (fee, with similar observations on the intrusive masses which 

 have pierced the Laurentian rocks of Grenville and Chatham. 

 We have also a series of examinations of the minerals of the 

 altered sediments of the various series, including the gneissose 

 epidotic and chloritoid rocks. His researches on the formation 

 of gypsum and magnesian rocks, commenced in a previous report, 

 are here brought to a close, and put us for the first time in pos- 

 session of a simple and satisfactory explanation of the origin and 

 formation of these deposits. 



In the appendix to the report is a very valuable catalogue of 

 the animals and plants collected by Mr. D'Urban in the coun- 

 ties of Argenteuil and Ottawa. This, and the catalogue of Lepi- 



* In a limestone probably of this age from Madoc, the carbonaceous 

 matter present is arranged in a manner which conveys the impression 

 on microscopic examination that it must have formed part of organic 

 tissues, and in slates associated with this limestone we have observed 

 cylindrical perforations resembling the Scolithus of the Potsdam sand- 

 atone. 



