VI PREFACE. 



especially his indebtedness for many paragraphs which have 

 been freely translated, and for a majority of the illustrations on 

 the horse's age, from Goiibaux and Barrier ; for illustrations on 

 the dog, from Girard ; to text and the use of illustrations on 

 the hog, from Dr. Olof SchwartzkopfF; and the use of illustra- 

 tions on the human mouth, from the White Dental Manufac- 

 turing Company, of Philadelphia. 



Rush S. Huidekoper. 



Broadway, cor. Fifty-third Street, 

 New York, October, 1891. 



