Geology and Mineralogy. 257 



100 pp., 12mo., Philadelphia, 1888. — Prof. Heilprin has here 

 presented a brief review of the more prominent facts in paleon- 

 tology supporting the theory of evolution. It is a carefully- 

 prepared statement made with little technicality, and illustrated 

 by good figures. 



9. Kilauea. — In the paper by Mr. J. S. Emerson, in volume 

 xxxiii, page 90, the words " Little Beggar," in line 27 from the 

 top should be " New Lake." 



10. Allgemeine und chemische Geologic von Justus Roth. 

 2nd volume, third part closing the volume. Crystalline Schists 

 and Sedimentary Rocks. — The author opens his chapter on the 

 Crystalline Schists with the remark that in his opiuion, the 

 schists are Plutonic, or the material of the earth's first-cooled 

 crust. He has thus got back to old an error, through the help of 

 the new facts put forward by Dr. Lehmann, just at a time when 

 opposing facts are fast multiplying. The value of the work, 

 however, is not much affected by the theoretical assumption, ex- 

 cept that he cites statements that coincide with the view, and 

 omits the facts that disagree with it. The rocks are described 

 with fullness, many chemical analyses are given, and long lists 

 of localities are added. Quartzite is placed rightly both under 

 "crystalline schists" and "Neptunian rocks;" but among his 

 North American localities those of the Taconic region of west- 

 ern New England are omitted/ evidently because the associated 

 mica schists of Western Massachusetts, alternating in some 

 places with the quartzite, would throw them with the " Plu- 

 tonic," and yet a Lower Paleozoic age is claimed for them, which 

 puts the author in suspense. 



11. Minercd Resources of the United States. — Calendar year 

 1886. David T. Day, Chief of Division of Mining Statistics and 

 Technology. 813 pp. 8vo. Washington, 1887, (U. S. Geological 

 Survey, J. W. Powell in charge). This fourth volume of the se- 

 ries of reports on the Mineral resources of this country, appears 

 with commendable promptness, reflecting credit in this respect as 

 in others upon the editor, Mr. David T. Day. Its scope is similar 

 to that of its predecessor, and like them it contains an immense 

 amount of valuable practical and scientific information not to be 

 obtained elsewhere. A large part of the space is given to de- 

 tailed discussions in regard to the important metals, fuels, build- 

 ing stones, etc., but there is also considerable fresh information as 

 to the rarer substances of less economic value. 



12. Native Platinum from Canada. — Mr. G. C. Hoffmann, of 

 the Canada Geological Survey, has contributed a series of analy- 

 ses of native platinum from Granite Creek, a branch of the Tula- 

 meen River in British Columbia. The specimen in hand con- 

 sisted of 98 per cent platinum with a little gold and 'pyrite; the 

 specific gravity was found to be 16*656 after removing the foreign 

 matter. It was separated into a magnetic portion (A), 37*88 per 

 cent, with G. = 16*095, and a non-magnetic portion (B) with G.= 

 17"017. The mean analyses gave : 



