5 66 



THE POPULAR SCIENCE MONTHLY. 



fruitful in results the increased friction of 

 modern life, especially in the sphere of emo- 

 tion, reaching the conclusion that the in- 

 crease is "not so much among the most 

 intellectual as among the least intellectual 

 and highly emotional classes of civilization." 

 The essay is throughout suggestive and well 

 worth perusal by those interested in one of 

 the most important fields of scientific inves- 

 tigation. 



New Characters of Mosasauroid Reptiles. 

 By Professor 0. C. Marsh. Reprint 

 from " The American Journal of Sci- 

 ence." Illustrated. 



The remains of mosasauroid reptiles, 

 though first discovered in Europe, were of 

 such rare occurrence as to offer only limit- 

 ed opportunities for study; but they have 

 been found in abundance in this country, 

 and the Museum of Yale College alone has 

 a collection containing some fourteen hun- 

 dred distinct individuals, representing sev- 

 eral families and numerous genera and spe- 

 cies. This profusion has enabled Professor 

 Marsh to make a very thorough examination 

 of the group, and he has been rewarded by 

 the discovery of several new characters, the 

 more prominent among them being the pres- 

 ence of a sternum probably common to all 

 the forms, the possession of posterior limbs, 

 and of hyoid bones. 



Bulletins 1, 2, 3 (Vol. V.), of the United 

 States Geological and Geographical 

 Survey of the Territories. Washing- 

 ton: Government Printing-Office. 1879. 



These numbers make a volume of five 

 hundred and twenty pages, comprising twen- 

 ty-five articles, giving results of original 

 work in the natural history, geography, phys- 

 ical features and resources of a portion of 

 our Western Territories. Among others, 

 Professors Riley, Cope, and White, Dr. Coues, 

 Dr. Le Conte, and Mr. Henry Gannett, have 

 each contributed to the volume. 



A Guide to Modern English History. By 



William Cory. Part I., 1815-1830. 



New York: Henry Holt & Co. Pp. 269. 



Price, $2. 



This book, the author says, has grown 

 out of an attempt made a few years ago to 

 give some account of English politics to a 

 foreign guest, who was not a Christian or a 



European, but who at the time was reading 

 English history for examination. Without 

 attempting to adhere to the plan of adapt- 

 ing statements to so remote a mind, the 

 author has thought it good to explain many 

 terms which in ordinary books are assumed 

 to be understood ; and he has done it very 

 successfully, in a plain, pleasant style, un- 

 der the form of a running review of the 

 principal events and political movements of 

 the period embraced. 



Introduction to the Study of Sign-Lan- 

 guages AMONG THE NORTH AMERICAN IN- 

 DIANS, as illustrating the Gesture-Speech 

 of Mankind. By Garrick Mallery, Bre- 

 vet Lieutenant-Colonel United States 

 Army. Issued by the Smithsonian In- 

 stitution, Bureau of Ethnology, Wash- 

 ington, 1880. 



This is the second of an important series 

 of papers on American ethnology ; the first, 

 issued some time since, being an " Introduc- 

 tion to the Study of Indian Languages," by 

 Professor J. W. Powell. A third is to fol- 

 low on " Mortuary Observances and Beliefs 

 concerning the Dead," by Dr. H. C. Yar- 

 row, of the United States Army. 



The study of anthropology is growing 

 rapidly in importance and interest in this 

 country. Vast collections of whatever may 

 illustrate it are being made, and these thor- 

 oughly scientific papers will facilitate and 

 direct the work. They are among the most 

 valuable issued by the Smithsonian Institu- 

 tion. 



Camps and Tramps in the Adirondack^, 

 and Grayling Fishing in Northern 

 Michigan : A Record of Summer Vaca- 

 tions in the Wilderness. By A. Judd 

 Northrup, Syracuse, New York : Davis, 

 Bardeen & Co. ; New York : Baker, 

 Pratt & Co. 1880. Pp. 302. Price, 

 $1.25. 



The author has undertaken in this little 

 volume to describe his life in the woods, his 

 adventures and talks, exactly as they oc- 

 curred, without invention or exaggeration, 

 and to give truthful pictures of actual sum- 

 mer life in the Adirondacks. By introduc- 

 ing the companions of his journeys, actual 

 men of education and refinement, but who 

 left the shop and the school behind them 

 for a holiday, he has made his story an 

 entertaining one. 



