4:68 Scientific Intelligence. 



brian to the Carboniferous and holding in places intrusive masses 

 of granitic and monzonitic rocks. Intrusive porphyries and 

 extrusive rhyolites are also present. Considerable space is 

 devoted to the contact phenomena and their relations to the ores. 



J. B. 



5. The Montana Lobe of the Keewatin Ice Sheet ; by Feed. 

 H. H. Calhoun. Professional Paper No. 50, U. S. Geol. Surv., 

 1906. Pp. 62, with 1 plates and 3 J figures. — This report covers 

 a region of much interest to glacialists, an area which lay 

 between the Keewatin ice sheet and the mountain glaciers com- 

 ing from the west. In studying this region four important sub- 

 jects were considered — the eastern drift, the mountain drift, the 

 deposits on the intervening area (which was not glaciated), and 

 the relations of these three surface formations to one another. 

 It was found that for thirty miles back from the margin the 

 average slope of the glacier must have been about 50 feet per 

 mile. It is further stated that this ice sheet also undoubtedly 

 turned the Missouri from a northern course and made it tribu- 

 tary to the Mississippi River. j. b. 



6. Les Lac Alpins Sitisses. Etude Chimique et Physique j 

 par le Dr. Felix-Ernest Bourcart. Pp. 130, with plates and 

 22 figures. Geneve, Georg & Co., Editeurs, 1906. — This work, 

 to which was awarded a prize by the Helvetian Society of Natu- 

 ral Sciences, was undertaken at the suggestion of Professor 

 Duparc as a subject for a thesis. Thirty-three lakes were exam- 

 ined in detail and complete observations made upon the color of 

 the water, transparency, the temperature at the surface and at 

 maximum depth and other features. Chemical analyses were 

 also made of the waters and the results are finally tabulated. 

 The report thus brings together a valuable body of data. J. b. 



7. The Species of Botryocrinus ; by F. A. Bather. Ottawa 

 Nat., vol. xx, pp. 93-104, August 15, 1906. — This paper contains 

 a comparison of all previously described species, with fresh diag- 

 noses based on the dorsal cups. The species are : Swedish, 

 B. ramosissimus Ang., B. cucurbitaceus (Ang.) : British, B. 

 ramosus Bather, B. decadactylus Bather ex Salter MS., B. pin- 

 nidatus Bather, B. quinquelobus Bather ; Australian, B. longi- 

 brachiatus Chapman ; N. American, B. nucleus (Hall), B.polyxo 

 (Hall), B. crassus (Whiteaves), B. americanus Rowley. All 

 these are Silurian except the two last, which are Devonian and 

 approach the Carboniferous Barycrinus in shape. American 

 workers are invited to consider the relations of Botryocrinus to 

 Cosmocrinus, Barycrinus, and Yasocrinus. [Author's abstract.] 



8. Soils, their Formation, Properties, Composition and Rela- 

 tions to Climate and Plant Growth in the Humid and Arid 

 Regions ; by E. W. Hilgard. Pp. xxvii, 593, with 89 figures. 

 — Every student of soils will welcome this volume from one of 

 the oldest and ablest soil investigators in North America. The 

 book is unique because of the full comparison between soils of 

 humid and arid regions and its special emphasis upon the physics 



