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, Eco- 

 nomics, Engineering, Medicine, and Dentistry are, and must be, most 

 interested in Man. 



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

 is contained within this work. Each part logically follows the part 

 preceding, and thus not only saves the student considerable time and 

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

 future professional years of study. Both the Bee and the Grasshopper 

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



(13) Then, too, the student who has his entire course of study 

 before him in a single work, 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 refer to another closely related 

 subject if the reference can be found by merely turning a few pages. 



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, as in many Dental 

 Schools, it is suggested that the first semester be given to "General 

 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 "Com- 

 parative Anatomy." 



The "Laboratory Manual for Biology and Embryology," by Pro- 

 fessor John Giesen, should be used with "General Biology" and "Intro- 

 ductory Embryology." 



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 

 career. However, as all of the books mentioned on pages 12 and 13 

 should be in every college library, those who wish such bibliographies 

 can find the best in Kellicott's "Chordate Development," Patten's "The 

 Early Embryology of the Chick," and Kingsley's "Comparative Anatomy 

 of Vertebrates." 



It is much more important for the student to know HOW to Com- 

 pile a Bibliography than to look over one already made. Therefore, in 

 the author's classes a different subject is assigned each student to look 

 up, for the purpose of compiling a bibliography of everything written on 

 that subject for the past forty years. Such subject may be taken from 

 any index of the Journal of the American Medical Association. 



Forty years are chosen because it is about that many years ago that 



