REVIEWS — GEOLOGICAL SURVEY OF CANADA. 465 



Note. — It may be interesting to compare the longitudes as determined by Lieut. 

 Ashe, -with the values previously assigned to them : 



H. m. s, 



Quebec, former value 4 45 04 



" Ashe 4 44 49.02 



Toronto Observatory, by M. 0. Stars in 1840... 5 17 19 



" by Chronometer with Boston 5 IT 33 



" Mean of above, formerly adopted 5 IT 26 



" Ashe 5 IT S3. 43 



Kingston, usual value 5 06 40 



" Professor 'Williamson, 1854 5 06 08.48 



" Ashe 5 05 54.52 



Chicago, usual value 5 50 20 



" Ashe 5 50 30.64 



EEYIEWS. 



Geological Survey of Canada. Figures and Descriptions of Canadian 

 Organic Remains : Decades I and IV. Montrealj 1859. 



A notice of the tMrd Part or Decade of this important publication 

 appeared in the Canadian Journal of last January.* It was there 

 explained how the work had been allotted by the Director of the 

 Survey, Sir "W. E. Logan, to different palseontologists. In conse- 

 quence of this arrangement, each part becomes more or less inde- 

 pendent of the other portions of the series, and thus no consecutive 

 order has been followed in their publication. Decade III, containing 

 IVIr. Billings' elaborate essay on our Canadian cystideans, with other 

 valuable papers, having been completed first, was first published. 

 Decades I and IV were issued a few months later, and it is to these 

 that we have now to direct the reader's attention. The first, by Mr. 

 Salter, one of the ablest of European palaeontologists, comprises a 

 series of figures and descriptions of various gasteropods and other 

 forms, chiefly from the beds at Pauquette's Rapids on the Ottawa, 

 in which a commingling of Chazy and Black Biver fossils, with those 

 of the higher portion of the Trenton Group, was first pointed out by 



• Ante, page 42. 



