

CONTENTS. 



BOOK II. 



THE PHYSIOLOGICAL CHEMISTRY OF DIGESTION. 



CHAPTER I. 



SALIVA AND ITS ACTION UPON FOOD. PAGE 



INTRODUCTORY OBSERVATIONS ON ENZYMES AND THEIR MODE OF ACTION 3 



SECT. 1. INTRODUCTORY SKETCH, CONCERNING THE STRUCTURE OF THE SALIVARY 



GLANDS 10 



Purposes served by the Saliva 10 



General Observations upon the Structure of the Salivary Glands 



when at rest 11 



The Nervous Supply of the Salivary Glands 13 



Phenomena associated with the Activity of the Salivary Glands . 14 

 Structural Changes in the Secretory Cells accompanying Activity of 



the Salivary Glands 15 



SECT. 2. THE CHEMICAL COMPOSITION OF MIXED SALIVA, OF THE SECRETION OF 



THE THREE CHIEF SALIVARY GLANDS, AND OF BUCCAL MUCUS . . 16 



1. Mixed Saliva 16 



Physical and Chemical Properties of Mixed Saliva .... 17 



The Saline Constituents of the Mixed Saliva 18 



Eesults of Quantitative Analyses of Mixed Saliva .... 21 



2. Parotid Saliva 21 



Physical and Chemical Characters of Normal Parotid Saliva . . 23 

 Characters of Parotid Saliva secreted on stimulation of Sympa- 

 thetic and Glosso-pharyngeal Nerves contrasted .... 25 



3. Submaxillary Saliva 25 



Physical and Chemical Characters of Normal Submaxillary Saliva . 27 

 Characters of Submaxillary Saliva secreted on stimulation of Chorda 



Tympani 28 



Characters of Submaxillary Saliva secreted on stimulation of Cer- 

 vical Sympathetic 30 



