424 Scientific Intelligence. 



11 plates, Bnlletin II, Colorado State Geological Survej', Boulder, 

 Col., 1910. — This bulletin is the result of six weeks' work in the 

 field by students and teachers under the direction of the Depart- 

 ment of Geology of the Colorado School of Mines during the 

 summer of 1909. The tract surveyed embraces about thirty 

 square miles lying due east of Blanca Peak, the highest peak of 

 the Sangre de Cristo Range. Pre-Cambrian gneiss and mica 

 schist on the west are flanked by Carboniferous sandstones and 

 limestones. The latter are intruded by masses of diorite, mon- 

 zonite ))orphyry, and felsite ; certain large areas being so cut up by 

 dikes that their separate mapping was impossible. An overprint 

 pattern was, therefore, used to designate such areas. j. b. 



12. Erdbeben. Erne EinfUhrunf/ in die Erdbehenkunde ,• von 

 ^yILLIAM IIerbeijt Hobbs. Erwciterte Ausgabe in deutscher 

 tjbersetzung, von Professor Dr. Julius Kuska. Pp. xxxii, 274, 

 with 30 plates and 124 figures. Leipzig, 1910 (Quelle and Meyer). 

 — It is pleasant to i-ecord that the work by Professor Hobbs on 

 earthquakes has met with so favorable a reception that a German 

 translation has been made. Studies of the most recent earth- 

 quakes, especially that of Messina, are included, and a chapter on 

 the methods of building construction adapted to earthquake 

 regions has been added. The volume considers the evolution of 

 the science of seismology, the origin of earthquakes, the broad 

 relations of earthquake regions on the earth, the detailed phe- 

 nomena of earthquakes, local and distant effects, and methods of 

 earthquake study, in the field and office. In the introduction 

 Professor Hobbs calls attention to the rapid growth of the subject 

 and its divergence into two distinct fields, that of the geophysi- 

 cist, to be pursued by mathematical and pliysical methods, and that 

 of the geologist, requiring field studies. j. b. 



13. Les Variations Periodiqiies des Glaciers redige par Dr. 

 Ed. Bruckner et E. Muret. Fourteenth report, 1908. Com- 

 mission Internationale des Glaciers. Extrait des Annales de 

 Glaciologie, iv., pp. 161-176, 1910. Berlin, 1910 (Freres Born- 

 traeger). — As noted in the introductory paragraph, it is evident 

 that during 1908 the retreat of glaciers was a general phenom- 

 enon. The marked growth of a group of Norway glaciers had 

 diminished slightly in 1908. These and certain Swiss glaciers 

 offer the only noteworthy exception? in the table. The commis- 

 sion by this report continues to lay the basis for a future exact 

 study of glacial variations and from them of climatic variations 

 in various parts of the world. Such an accumulation of data for 

 the use of the next and future generations is one of the most far- 

 sighted movements of present science. j. b. 



14. Etudes Olaciologiques, Tirol Autrichien, Massif des 

 Grandes Rousses. Service d'etudes des Grandes Forces Hydrau- 

 liques (Region des Alpes) Ministere de I'Agriculture 1909. I — 

 Forages Glaciaires d Grande Profondetir par MM. Flusin et 

 Bernard. II — J^tudes Glaciares, Geographiques et Botaniques 

 dans le Massif des Grandes Rousses jsar MM. G. Flusin, C, 



