

physiology of the animal and to furnish the facts on which to build in- 

 terpretations and principles. 



(9) In such work as that on the Malarial Parasite the result of 

 scientific work is first shown so as to cause the student to wonder how 

 such a mass of intricate detail could ever have been discovered. Then 

 a detailed account of the painstaking and intelligent effort necessary to 

 make such findings valuable is given. 



(10) Histology and Genetics are stressed because in all biological 

 work a thorough knowledge of the cell and tissues is a prerequisite for 

 further work, and Neurology, because of its tremendous importance in 

 all Biological, Psychological, and Medical fields. 



(11) Examples, wherever possible, have been chosen in so far as 

 they add to, or detract from human welfare, for, after all, Students of 

 Education, Law, Philosophy, Psychology, Sociology, Theology, Econom- 

 ics, Engineering, Medicine, and Dentistry are, and must be, most inter- 

 ested in Man. 



(12) All that is needed for two complete years of biological work 

 is contained within this one volume, each part logically following the 

 part preceding, thus not only saving the student considerable time and 

 expense, but also serving him as a sort of continual reference work in 

 his future professional years of study. Both the Bee and the Grass- 

 hopper have been included so that teachers may use their preferred form. 



(13) Then, too, the student, having his entire course of work be- 

 fore him in a single volume, often, of his own volition, reads much more 

 than he normally would were the subject matter scattered through sev- 

 eral texts, for it is an easy matter to refe.r to another closely related 

 subject if the reference can be found by a mere turning of a few pages, 

 rather than consulting a number of separate books. 



The book is so written that it can be used as a text for General 

 Biology, General Zoology (by merely omitting Chapters XV and XVI) 

 for Introductory Embryology, and for Comparative Anatomy. 



Where only one year is given to biological work, such as in many 

 Dental Schools, it is suggested that the first semester be given to "Gen- 

 eral Biology" or "General Zoology" made up of selected chapters from 

 the first half of the Text, while the second semester be confined to the 

 higher forms such as Dogfish, Turtle, and Cat or Rabbit, as found in 

 ''Comparative Anatomy." 



The Laboratory Manual to accompany "General Biology" and "In- 

 troductory Embryology," written by Professor John Giesen, will be 

 ready for general distribution by June, 1923. 



Dr. L. H. Hyman's "A Laboratory Manual for Comparative Verte- 

 brate Anatomy" (University of Chicago Press), is being used for the 

 Comparative Work in Anatomy. 



Long Bibliographies have not been given in this book, as these are 

 seldom consulted by a student during the first two years of his college 



