VI PIIEFACE 



programme of eliminating or at least diminishing the ravages 

 of tuberculosis and venereal disease upon our population. 



On the other hand, an acquaintance with a variety of ani- 

 mals may well heighten an interest in nature and lift the 

 mind away from the sordid and petty things of which our 

 modern life in gi-eat cities is all too full. A love of nature is 

 a moral tonic. 



The Laboratory Guide has been omitted from this volume. 

 This has been done because the best teachers prefer each to 

 use his own laboratory guide based upon animals and equip- 

 ment at his command and his experience as to the work that 

 is most swcessful with his own pupils. This is quite as 

 it should l)e. With the modern juethods of manifolding, a 

 teacher can strike off in a short time directions to an indefi- 

 nitely large class, and vary them as he thinks fit from year 

 to year. 



The book remains, not a treatise on the science of zoology, 

 but an introduction to the study of animals. It contains an 

 outline of what we conceive to be most important for the 

 ordinary citizen to know concerning animals, and it will, we 

 trust, stimulate a few to pursue the study of animals as a life 

 work with the aim of adding to human knowledge and dis- 

 covering important guiding principles. 



The book is somewhat profusely illustrated. Many of the 

 figures are from photographs. Many of the photographs of 

 the late W. H. ( '. Pjnicheou and V. H. Lowe renmin ; those 

 of the former being mostly of invertebrates at Cold Spring 

 .Harbor. In addition to those gifts of prints and cuts acknowl- 

 edged in the Preface of tlie First Edition, we have to thank 

 Mr. W. S. Blatchley for permission to reproduce from his 

 "Gleanings from Nature " our Figures 9.") a and 96. For per- 

 mission to reproduce Figures 412 to 414, 417 to 418, and 420, 



