AMERICAN EDITOR'S PREFACE. 



IN again presenting to the American profession Dr. Carpenter's 

 standard work on Human Physiology, the Editor has made such addi- 

 tions as seemed advisable to supply the material which has accumulated 

 both in Europe and this country since the publication of the English 

 Edition. The additions will be found distinguished by brackets [--], 

 and the volume, it is believed, now accurately represents the existing 

 state of physiological knowledge. 



The Editor desires to express his acknowledgments to Dr. J. Ott, 

 Demonstrator of Physiology in the University of Pennsylvania, and to 

 Dr. Robert M. Smith, Assistant Demonstrator in the same institution, 

 for valuable aid in preparing the material for the press. 



PHILADELPHIA, 



September, 1876. 



