Review 155 



study of types is thus reduced to its lowest terms. Nevertheless, so 

 skillfully and thoroughly are the details derived from these several 

 sources interwoven and tied together that aside from problems of 

 evolution and classification most of the great principles of Biology 

 are well presented. For example, upon the study of a simple, single- 

 celled plant, including experimentation and microscopic examination, 

 is based the fundamental biological concept that in the last analysis 

 the world's supply is dependent absolutely and completely upon the 

 green material of plants. Likewise a single simple animal is used to 

 establish the equally important generality that animals are primarily 

 transformers and liberators of the energy stored by green plants. 

 The limits of this review would hardly permit an epitome of the treat- 

 ment devoted severally to the yeasts, bacteria, and molds. Suffice it to 

 say that they are handled adequately, clearly, and forcefully, both as 

 to their beneficial and their baneful activities. I^o person, especially 

 a woman, who puts into practice the information contained in this 

 book can fail to live a healthier, happier, and more efficient life her- 

 self, and to contribute immeasurably to the well-being of those depend- 

 ent upon her ability to make a well-ordered home. 



''It is difficult better to express briefly the contribution of the book 

 than to quote its purpose as stated by the author — 'to do two things 

 for the students who use it : to give them a sound scientific conception 

 of some of the great fundamental principles of Biology and to drive 

 home to them such a practical knowledge of certain most important 

 living things as will enable them to live healthier and happier lives,' 

 and then to say that in tlie judgment of the reviewer, and in the slang 

 of the day, he has made good, 



''It is a real pleasure to chronicle the api)earance of a practical book 

 of such excellence from a neighbor institution, and to say that, in the 

 opinion of the writer, the inclusion of a course in Biology such as is 

 here worked out would contribute strength and depth to any serious 

 study of domestic economy." 



