238 Scientific Intelligence. 



SCIENTIFIC INTELLIGENCE. 



I. Geology. 



1. Geology of the Adirondack Magnetic Iron Ores ; by 

 D. H. Newland, with a Report on the Mineville-Port Henry 

 Group ; by J. F. Kemp. N. Y. State Mus. Bull. 1.19, 8°, pp. 

 182, pis. and maps. Albany, 1908. — This work gives a detailed 

 description of the geology, petrography, and occurrence of the 

 iron-ore bodies in the eastern and northern Adirondack region. 

 It contains also much material relating to the history of the min- 

 erals and mining of the area. It will no doubt prove of great 

 service to those locally concerned in these deposits, and contains 

 much of interest to those engaged in economic geology and in 

 the study of ore deposits. From the descriptions given it would 

 appear that the unusable titaniferous ores are magmatic segrega- 

 tions of the gabbro-anorthosite masses (p. 149); while the 

 purer and worked magnetites, which have a different method of 

 occurrence, are probably, in part at least, due to pneumatolytic 

 processes as suggested by the presence of fluorite in the Palmer 

 hill and other mines (pp. 31-33 and 100). l. v. p. 



5. Geologische Prinzipienfragen • von E. Reyer. Pp. 202, 

 254 figs. Leipzig, 1907 (Wm. Engelmann). — There was a time, 

 in the recollection of older geologists, when Reyer's name was 

 associated with the active publication of works on various geo- 

 logical subjects and on the geology of particular regions, marked 

 by a highly theoretical and, at times, imaginative treatment. In 

 the present work the author states that finding his views, espe- 

 cially those relating to the origin of mountain ranges, not gener- 

 ally accepted, he engaged in lines of work other than scientific, but 

 now, convinced that eventually his experiments and views 

 must prove of service, he feels it incumbent upon him to publish 

 them in a general statement.. While it would be entirely out of 

 place in this brief notice to enter into a critical discussion of the 

 author's views on fundamental geological problems, it may be men- 

 tioned that some of the more important subjects treated relate to 

 the origin and manner of igneous intrusions and extrusions, to 

 the part played by volcanic islands, to the igneous phenomena as 

 displayed in the Alps, to the origin of mountain ranges, to ele- 

 vation and depression of the crust, etc. The author says frankly 

 at the outset that he expects opposition to his views, which, in 

 many cases at least, depart widely from those generally held 

 to-day, and in some instances represent theories which have been 

 discarded in the evolution of geological science. While this is 

 true, the work is at least suggestive, and even if the reader does 

 not accept the presentation of the particular theses discussed, he 

 may find a strong sidelight cast on some special problem in 

 which he is interested. ' l. v. p. 



2. Die Entstehung der IContinente, der Vtdkane und Gebirge / 

 von P. O. Kohlee. 8°, 58 pp., Leipzig, 1908 (Wm. Engelmann). — 



