4 PREFACE 



laboratory course in zoology these chapters should be 

 omitted, except for general reading. 



This text is not intended to bo used as a substitute 

 for laboratory study. In my Experimental Physiology 

 and Anatomy are outlined laboratory exercises which 

 should be first performed by the pupil himself, if possible, 

 before he is assigned a lesson in this text. While written 

 as a supplement to the laboratory guide mentioned, the 

 text is suited for use with any other laboratory manual 

 and, where lack of laboratory facilities renders such pre- 

 liminary work impossible, its description of the laboratory 

 exercises is sufficiently full to permit its use where a text- 

 book alone must serve. 



The text meets both the optional and required work of 

 the New York State Syllabus and the requirements of the 

 Harvard entrance examinations. 



Its topical arrangement and the printing of less impor- 

 Gant details in finer type make it adaptable to longer or 

 shorter courses of study; and in these structural details 

 the author has endeavored to make the book meet the 

 needs of all classes of schools. 



I wish to acknowledge the helpful suggestions given 

 me by my colleagues of the High School of Commerce, 

 and by Professor Geis of Columbia University and Dr. 

 Darling of Harvard University. I am especially indebted 

 to my colleague Mr. C. W. Plahn for his very careful read- 

 ing of the proofs and his many helpful suggestions, and 

 to my wife for assistance in the revision of grammatical 

 arrangement and in the mechanical details of the work. 



W. H. EDDY. 



The High School ov Commerce, 

 New York. 



