192 Scientific Intelligence. 



Part II includes an account of sexual phenomena in plants and 

 animals ; the origin and development of the germ cells ; sex dif- 

 ferentiation and inheritance ; and the evolution of sex. 



Part III is devoted to variation and heredity, and Part IV to 

 the adaptation of organisms to their environment, and the evi- 

 dences of organic evolution as revealed by a study of comparative 

 anatomy, embryology, and paleontology. 



Part V, on the factors of organic evolution, discusses the more 

 important theories of evolution, concluding with the evidence as 

 to the ancestry of man. 



The book is written in an entertaiuing style and, with the excep- 

 tion of the discussion of the evidence as to the inheritance of 

 acquired characters, is free from personal bias. w. E. c. 



2. College Zoology ; by Robert W. Hegner. Pp. xxiv r 733, 

 with 553 illustrations. New York, 1912 (The Macmillan Com- 

 pany). — While this is essentially a systematic treatise on the more 

 important groups of the animal kingdom, it differs from most 

 text-books of zoology in emphasizing the physiological rather 

 than the morphological aspects of the subject. Structural details 

 are given only as far as is necessary for a clear understanding of 

 the relationships of the different groups. Of the numerous illus- 

 trations the majority are taken from our native species. Emphasis 

 is laid on the economic importance of the various groups and 

 species, and, in order to increase the general usefulness of the 

 work, more attention is paid to the vertebrates than to the other 

 phyla. 



In each phylum a single species of the greatest importance is 

 chosen as a type and described in some detail before taking up 

 the systematic account of the various groups included. The same 

 system is followed for the classes of vertebrates. w. r. c. 



3. Le Zebre : Studio Zoologico popolare ; by Dr. Achille 

 Griffini. Pp. xxvii, 298. Milan, 1913 (Ulrico Hoepli).— The 

 Hoepli manuals, of which this little volume is one of the 1200 already 

 published, consist of treatises on all branches of science, art, liter- 

 ature, and industries. They are all written in popular Italian 

 language by authorities in the various branches of knowledge. 

 This book contains an account of all the known species and vari- 

 eties of the zebra, with information concerning those specimens 

 which have been kept in various zoological gardens and the 

 hybrids which have been secured from them. w. r. c. 



4. Principles of Economic Zoology ; by L. S. Daugherty 

 and M. C. Daugherty. Pp. vii, 410, with 301 illustrations. 

 Philadelphia and London, 1912 (W. B. Saunders Company). — 

 This is essentially a condensed Natural History of Animals, with 

 special reference to those of economic importance. In addition 

 to a brief description of the structure, habits, and economic rela- 

 tions of each of the important groups of animals, there is given, in 

 smaller type, a vast amount of information concerning the natural 

 history of numerous individual species. 



The book is designed for use as a text in a course in zoology 

 where the relations of animals to human interests are emphasized. 



w. r. c. 



