390 Scientific Intelligence. 



consequences ; the various " f acies " of sediments and sedimenta- 

 tion over the globe ; deformation through pressure and other 

 means, and the attendant fracturing, flexing, compression, fault- 

 ing ; metamorphism of different sources; foliation; and other 

 topics in dynamical geology. The views of the work are those 

 of an independent thinker, whose geological excursions have had 

 a wide range, western North America being included. They 

 are fairly presented, with a recognition of the labors of others, 

 and merit full consideration, if sometimes questioned. The work 

 is well adapted for the student by its clear style and very numer- 

 ous illustrations. 



3. Les Formes du Terrain, par G. de la Noe, Lieut.-Col. du 

 Genie au Service Geographique, avec la Collaboration de Emm:. 

 de Margerie. Paris, 1888. Service Geographique de PArmee. 

 206 pp. 4to, with 48 plates. — The subject of this work is essen- 

 tially topography as determined by the action of running waters, 

 aided by disaggregating atmospheric agencies, on rocks, differing 

 in kind and firmness, in all their various forms and positions, 

 horizontal, tilted or oblique, flexed, etc. The topics are treated 

 in a systematic way, with great fullness of detail, making the 

 volume a comprehensive review of the methods and results of 

 denudation. They are further illustrated by sketches and sec- 

 tions on the many plates. Part of the facts and illustrations as 

 well as some important principles are taken* from authors on 

 Rocky Mountain topography, especially Powell and Gilbert. The 

 volume is a valuable contribution to the science of geology as 

 well as that of physical geography. 



4. The Structure and Classification of the Mesozoic Mam- 

 malia ; by H. F. Osborn, Prof. Comp. Anat. Princeton College. 

 July, 1888 (Journal Acad. N. Sci. Philad., vol. ix, no. 2). — Prof. 

 Osborn here gives a very valuable review of the characters and 

 relations of the Mesozoic mammals of America, Great Britain and 

 other countries, with figures illustrating the subject and new facts 

 and figures relating to the American species. The animals were 

 all small, the length of jaw varying from half an inch to an inch 

 and a half. Prof. Osborn sustains the view that they are not all 

 marsupial, but that placental mammals are included, probably 

 the Insectivora or their predecessors, and that marsupial and 

 placental mammals have not successional but parallel genetic 

 relations. 



5. Eozoon Gan.adense. — Dr. Dawson, in a paper on " Speci- 

 mens of Eozoon Canadense" in the Museum of McGill Uni- 

 versity, Montreal, recently published by the Museum, besides 

 describing specimens, reviews anew the Eozoon question. After 

 mentioning on page 50, his own paper in this Journal criticizing 

 Professor Mobius's memoir on the subject, he observes that " the 

 editor of the American Journal of Science gave Professor M. an 

 opportunity to reply, but stated that he had pledged himself 

 [promised Professor Mobius, on condition of his writing out his 

 views for the Journal] that no rejoinder would be permitted — a 



