300 ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



report by Professor Thompson, the topographer, who has 

 been the companion and associate of Professor Powell dur- 

 ing most of the period of the Burvey. The second part is 

 upon the physical features of the valley of the Colorado. 

 The third part, upon the zoology, consists of papers upon 

 the genera Geomys and Thomomys forms of rodent mam- 

 mals very abundant in the region explored and prepared 

 by Dr. Elliott Cones. 



The illustrations of the volume consist of two maps and 

 eighty wood-cuts, of which about thirty represent geological 

 sections, and about fifty landscape and other views. These 

 latter are especially interesting from having been well en- 

 graved by H. H.Nichols, of Washington, from stereoscopic 

 negatives printed directly on the wood, thus guaranteeing 

 their fidelity, and proving that to be practicable which has 

 been generally considered impossible. 



REPORTS OF THE NORTHERN BOUNDARY SURVEYS. 



It will be remembered that several years ago an interna- 

 tional commission was appointed to mark the boundary be- 

 tween the United States and British America, from the Lake 

 of the Woods to the summit of the Rocky Mountains, along 

 the forty-ninth parallel of latitude. This survey from the 

 east was made to meet the point at which the line started 

 in 1857 from the Pacific Ocean had stopped in 1860. The 

 superintendence of the second branch of the American line 

 of the survey, as that of the first, was intrusted to Mr. Arch- 

 ibald Campbell, of Washington, with Major Twining, of the 

 United States Engineers, as astronomer and surveyor, and 

 Dr. Elliott Coues as geologist and naturalist, and the line 

 was finished in 1874. Since then the American party has 

 been engaged in preparing its report for publication. 



The British branch of the survey has been not less indus- 

 triously occupied, and has, indeed, anticipated its American 

 colleagues in commencing the publication of the report, of 

 which the first part that on geology and the resources of 

 the region of the forty-ninth parallel, by George M. Dawson, 

 Esq. is before us. Mr. Dawson is a son of the well-known 

 Principal Dawson, of M'Gill College, Montreal, and inherits 

 his father's tastes in the line of geology and paleontology. 



The report, which is addressed to Major D. R. Cameron, 



