UNIVERSITY 



PREFACE. 



r I "HIS book is written for those who have 

 J- some elementary knowledge of Physiology. 

 It gives a general outline of the origin, structure, 

 typical forms, and functions of living things, so as 

 to serve as an introduction to the examination of 

 the objects themselves. 



Although a text-book must of necessity be a 

 compilation of facts, yet many years of practical 

 experience with the microscope have enabled the 

 writer to describe many things with the confi- 

 dence of personal observation. Some of the illus- 

 trations are original, others have been selected 

 from Dr. Carpenter's works on Physiology and 

 the Microscope, T. R. Jones on Zoology, Lind- 

 ley's Botany, Mac Ginley's Introduction to Biol- 

 ogy, and other standard works. 



It has been the aim of the author to guide the 



student through the fundamental principles of 

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