4 PEEFACE. 



ings, such as are contained in this work. Models, especially those 

 constructed by Auzoux of Paris, dried preparations of the human 

 body, and the organs of the lower animals, may also be used with 

 advantage. 



The writer desires to acknowledge his indebtedness to R M 

 WYCKOFF, M.D., for valuable aid in the preparation of the manu- 

 script for the press; and to R. CRESSON STILES, M.D., a skilful 

 microscopist and physician, for the chapter " On the Use of the 

 Microscope in the Study of Physiology." Mr. AVON C. BURNHAM, 

 the well-known teacher of gymnastics, furnished the drawing of 

 the parlor gymnasium and the directions for its use. 



Brooklyn, N. Y.< 1870. 



