PREFACE. XI 



appreciation of the figures and to aid him in seeing that 

 for which they are inserted. They should be studied. 



4. Whatever emphasis the teacher desires to give to 

 his course, the supplementary topics at the end of the 

 chapters will be found to serve a most useful purpose in 

 allowing the pupil to undertake extra work of his own 

 choosing and in which he himself is interested. 



5. Two sizes of type are used. The matter in larger 

 type can be completed by a good class in a year. That 

 in fine print is intended as a background for reference 

 and for extra work. The coarse print outlines a year of 

 work for the teacher who wishes to use the scientific 

 view as primary and to supplement it with a liberal amount 

 of matter involving the human interest. 



The author hereby expresses his gratitude to Professor 

 Fred L. Charles, of Illinois University, and to Paul Welch, 

 Assistant in Biology at Millikin University, for assistance 

 and suggestions while the book was in manuscript; to 

 D. Appleton & Co. for the use of figures of the brain; to 

 Dr. J. W. Folsom and to P. Blakiston's Son & Co. for 

 the use of figures from Folsom 's " Entomology." 



T. W. GALLOWAY. 



