134 



THE POPULAR SCIENCE MONTHLY. 



pecially remarkable for its diminutive size. 

 From an extended comparison of the brain- 

 cavities of Tertiary mammals, Professor 

 Marsh has found that there vas a gradual 

 increase in the higher portion of the brain 

 during this period, and that the brain of a 

 mammal fitted for a long survival was pro- 

 portionately larger than the average. The 

 remains of Tbwccras are found in the same 

 lake-basin, but at a higher level, and the 

 evidence is clear that it was a later and 

 more specialized form. Tinoccras ingcns, 

 as he stood in the flesh, was about six and 

 a half feet in height to the top of the back, 

 and about twelve feet long. His weight 

 was probably at least six thousand pounds. 

 Dinoceras mirahiie was about one fifth 

 smaller. In an appendix Professor Marsh 

 gives a synopsis of Dinoccrata, in which all 

 the known species of the order, about thirty, 

 are recognized, and a bibliography follows 

 the sjTiopsis. With the aim of making the 

 illustrations tell the main story to anato- 

 mists, the author has incorporated in the 

 volume fifty -six fine, large lithographic 

 plates, and nearly two hundred original 

 woodcuts, representing all the more im- 

 portant specimens of the Dinoccrata now 

 known, and including at least one figure of 

 every species. 



Paleontology of the Eureka District. 

 By Charles Doolittle Walcott. Wash- 

 ington : Government Printing-Olficc. Pp. 

 298, with Twenty-four Plates. 



In this report are presented the results 

 of a careful survey of a district with a rich 

 fauna, through thirty thousand feet of Palai- 

 ozoic strata, representing the Cambrian, Si- 

 lurian, Devonian, and Carboniferous rocks. 

 It is regarded by Mr. Aniold Hague, geolo- 

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 most important contribution yet made to the 

 invertebrate paleontology of the basin ranges, 

 and of great value in its bearings upon the 

 geology of the Cordilleras." 



The Manual of PHONOORAPnY. By Benn 

 Pitman and Jerome B. Howard. Cin- 

 cinnati : Phonographic Institute. Pp 

 144. 



This is a revised edition of the " Man- 

 ual " by Benn Pitman, the first edition of 

 which appeared in 1855. While a number 

 of new features appear in its pages which 



were not in its predecessor, the plan of pre- 

 senting the system is essentially the same. 

 Such changes and additions to the system, 

 and such only, as are of real importance 

 have been adopted. 



Chemical Problems. By Dr. Karl Stam- 

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 Philadelphia : P. Blakiston, Son & Co. 

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A LIST of questions on the properties 

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 from what he knows. The answers are 

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The exercises in this volume have been 

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 Grammar," to which he is constantly re- 

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 ences, and general suggestions are provided. 



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