AN ELEMENTARY COURSE OF 

 PRACTICAL ZOOLOGY 



PART I 

 CHAPTER I 



SCOPE OF THE SCIENCE OF BIOLOGY THE FROG : PRELIMIN- 

 ARY SKETCH OF ITS STRUCTURE, LIFE-IIISTORV, AND 

 VITAL FUNCTIONS HINTS ON DISSECTION 



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 



Pract. Zool. t! 



