380 NATURE-STUDY REVIEW [10:9— Dec. 1914 



at the top of the charts are out of order and paragraph two of the 

 explanation should be omitted. 



The author has evidently settled in her own mind that Darwin's 

 theory of the origin of species deserves an important place along 

 side of evolution by mutation, and the book presents evolution 

 from that combined point of view. The first five chapters discuss 

 the lines of inheritance; the next nine present evolution as ex- 

 plained through Darwin's five factors, mutation, and isolation. 

 Chapters fifteen and sixteen discuss fertilization and development. 

 The next gives data to prove that germ cells and therefore offspring 

 are damaged by use of alcohol. Chapter eighteen attempts to 

 acquaint the adolescent with himself. Chapter nineteen demon- 

 strates the injurious effect of tobacco and twenty, of alcohol as a 

 beverage. Chapter twenty-two is on family responsibility and the 

 remaining chapters give suggestions for protecting the stream of 

 life from various types of pollution. 



The concluding pages of the book give a number of questions for 

 each chapter which may help the inexperienced teacher in using the 

 book as a text. There is a short bibliography of some of the best 

 books on the various subjects treated. 



