Geology and Mineralogy. 75 



Glacial epoch is unavoidably deferred to the following number of 

 this Journal. 



16. Mikroskopische Physiographie der petrographisch wich- 

 tigen Mineralien von H. Rosenbusoh. Dritte Avflage. 712 pp. 

 Stuttgart, 1892. (E. Schweizerbart'sche Verlagshandlung — E. 

 Koch.) — Nothing is more significant of the great progress in 

 recent years in petrographical and mineralogical research than 

 the appearance of this important work in its third edition. In 

 thus keeping this book abreast of the times Prof. Rosenbusoh is 

 continually placing all petrographical students and investigators 

 under deep obligation. The new edition contains much newly 

 added matter, new methods of research and of determination of 

 physical constants, the latest corrections in the optical and chem- 

 ical constitution of the mineral species, with added observations 

 upon their occurrence, alterations, etc. Besides this, many new 

 mineral species have been added, that the progress of research 

 has shown in the last half dozen years are to be regarded as im- 

 portant rock-forming constituents. A large part of these latter 

 are the minerals described by Brogger from the eleolite-syenite 

 of southern Norway but among them will be found such species 

 as allanite, chondrodite, dumortierite, lasurite, lazulite, pectolite, 

 piedmontite, prismatine, sapphirine, xenotime, etc., as examples. 

 The addition of these species cannot fail to stimulate petrograph. 

 ical research. The index to literature has been removed and the 

 author promises it undivided in a new edition of the second vol- 

 ume which it is to be hoped will soon appear. l. v. p. 



17. Die Gesteine de Mcuatonanische West Gordillere. Inavg. 

 Diss. M. Belowsky, Berlin, 1 892. 70 pp. — This work is a con- 

 tinuation of that of Kiich on the rocks collected by Reiss and 

 Sttibel.* After a short notice of some gneisses, mica schists and 

 diabases, the main body of the work is devoted to a description 

 of series of andesites and dacites. These are described as to 

 their structure and mineral composition with great minuteness 

 but no analyses are given nor are their chemical relationships 

 discussed. It is to be hoped that these points may be taken up 

 in a later work of the series. l. v. p. 



18. Chemical Contributions to the Geology of Canada, from 

 the laboratory of the Survey, by G. Christian Hoffmann, 1892. 

 —This report contains a number of valuable contributions to the 

 Mineralogy of Canada. Among others is to be noted the occur- 

 rence of a massive cobaltiferous arsenopyrite, or danaite, in the 

 township of Graham, Algoma, Ontario. An analysis by R. A. A. 

 Johnston, after deducting 4*77 p. c. quartz, gave: 



As S Fe Co Ni Sb Au 



(y.— 5-988 42-22 18-84 33-32 4*09 0-93 0-60 tr. = 100 



The rare mineral gersdorffite, not before noted in Canada, has 

 been found in the township of Denison, Algoma, where it occurs 



* W. Reiss und A. Stiibel : Reisen in Slid Amerika ; Geolgische Studien in der 

 Republik Columbia, I Petrographie 1 Die vulkanischen Gesteine bearbeitet von 

 R. Kiich, Berlin, 1892. 



