September 20, 191 7] 



NATURE 



55 



the several species. Taking Apatosaurus as an illus- 

 tration, Mr. Mook points out the necessity of making 

 allowance for differences of age in the various indi- 

 viduals compared ; which differences can generally be 

 recogni.sed by studying the degree of fusion of certain 

 bones and the development of crests and rugosities 

 on them. 



As an aid to the study of Prof. Osborn's numerous 

 papers on the fossil vertebrate animals, we welcome 

 the handsome second edition of the Bibliography of 

 his published writings which we have just received. 

 It includes a classified index as well as the usual 

 chronological list, and forms a most useful com- 

 pendium for the student. It shows not merely where 

 Prof. Osborn has described the various fqssils, but 

 ilso where he has discussed the points of philosophical 

 interest which arise from these descriptions. 



A. S. W. 



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NO. 2499, VOL. 100] 



