AN ELEMENTARY COURSE OF 

 PRACTICAL ZOOLOGY 



PART I 

 CHAPTER I 



SCOPE OF THE SCIENCE OF BIOLOGY THE FROG : PRE- 

 LIMINARY SKETCH OF ITS STRUCTURE, LIFE-HISTORY, 

 AND VITAL FUNCTIONS HINTS ON DISSECTION AND 

 DRAWING 



Biology, Zoology, and Botany; There is a good deal of 

 misconception as to the scope of the science of Biology. 

 One often meets with students who think that while the 

 study of animals as a whole is Zoology and the study of 

 plants as a whole Botany, Biology is the study of a 

 limited number of animals and plants, treated as if they 

 had no connection with anything else, even with one 

 another. 



This is quite wrong. Biology is the master-science 

 which deals with all living things, whether animals or 

 plants, under whatever aspect they may be studied. 

 Physiology, treated for practical purposes as a separate 

 subject, is a branch of biology ; so is anatomy, to which 

 the medical student devotes so much time ; so are botany 



PRACT. ZOOL. j 



