416 Revieics — Osborn's Tertiary Mammal Sorizons. 



1 



in mind the requirements of the intelligent general reader whom 

 it is desired to convert into a student of the subject. That the 

 writer is imbued with a true love of scenery is abundantly evident 

 in many passages, and the feeling of the book is throughout 

 conceived in the spirit of such classical exponents of the scientific 

 beauties of scenery as Forbes, Tyndall, Euskin, and Geikie ; and in 

 passages, as for instance on p. 201, in which the play of colours 

 observed on Windermere is described, and again in his concluding 

 chapter on the preservation of natural beauties, the author shows 

 himself capable of the highest appreciation for the poetry of his 

 subject. 



The verbal slips in the book are few and insignificant. We would 

 call attention to ' windward ' on p. 264, for which ' leaward ' 

 is evidently intended ; the letter S has been omitted in fig. 14, 

 although alluded to in the legend ; it would facilitate reference from 

 the text if the plates were numbered ; on p. 273 the reader might 

 conclude that the hexagonal and rhombohedral systems were 

 separate and distinct. In alluding to the evaporation of snow 

 and camphor the process is referred to as ' sublimation.' In Watt's 

 Dictionary of Chemistry sublimate is defined as " a body obtained in 

 the solid state by the cooling of its vapour." Again, on p. 278 we 

 have a curious sentence on the angle of accumulation of snow which 

 concludes "the latter" (the aiguilles), "being at an elevation 

 inferior to that of the topmost dome." Surely, as the Germans say, 

 " das versteht sich." 



The photographic illustrations have been carefully selected and 

 excellently reproduced ; they are all to the point, and fully described 

 in the text, an innovation on the usual method, on which we beg to 

 congratulate the author, as indeed we do most heartily on the whole 

 work, and we recommend it most thoroughly to all true lovers of 

 scenery, both general and scientific. 



II. — Correlation between Tertiary Mabibial Horizons of 

 Europe and America. An Introduction to the more exact 

 Investigation of Tertiary Zoogeography, Preliminary Study 

 with Third Trial Sheet. — Two Presidential Addresses before the 

 New York Academy of Sciences. — By Henry Fairfield Osborn. 

 (Annals N.T. Acad. Sci., vol. xiii, No. 1, pp. 1-72, July 21, 1900.) 



WE heartily agree with Professor Osborn that no-one can oppose 

 the immediate adoption of the fundamental principle that the 

 old and new world palEsontology should be studied as a unit : 

 although considerable time must elapse before a consensus of opinion 

 can be arrived at, there is no doubt that the best way is to set 

 to work viribus unitis. Professor Osborn has taken the lead, and 

 well he may ; for he is better acquainted with the Tertiary mammal 

 horizons of Europe than any one of his European colleagues with 

 those of the new world. 



In 1897 and 1898 he drew up and circulated for criticism 

 amongst old-world palaeontologists two successive trial sheets 

 " of the typical and homotaxial Tertiary horizons of Europe " ; 



