Xii CONTENTS. 



SECTION ''AGE 



124. Composition of Expired Air, . . . 254 



125. Daily Quantity of Cases Exchanged, 256 



126. Review of the Daily Gaseous Income and Expenditure, . . . 256 



127. Conditions Influencing the Gaseous Exchanges, 256 



128. Diffusion of Gases within the Lungs, ... . . 259 



129. Exchange of Gases between the Blood and the Air, .... 260 



130. Dissociation of Gases, 263 



131. Cutaneous Respiration, ......... 264 



132. Internal Respiration, . 265 



133. Respiration in a Closed Space, ........ 267 



134. Dyspnrea and Asphyxia, 268 



135. Respiration of Foreign Gases, ........ 271 



136. Accidental Impurities of the Air, . ...... 272 



137. Ventilation of Rooms, .... .272 



138. Formation of Mucus, 273 



139. Action of the Atmospheric Pressure, 275 



140. Comparative and Historical, . . 277 



IV. PHYSIOLOGY OF DIGESTION. 



141. The Mouth and its Glands, 279 



142. The Salivary Glands, . 280 



143. Histological Changes in the Salivary Glands, ..... 283 



144. The Nerves of the Salivary Glands, 285 



145. Action of Nerves on the Salivary Secretion, ..... 286 



146. The Saliva of the Individual Glands, 291 



147. The Mixed Saliva in the Mouth, 292 



148. Physiological Action of Saliva, ........ '294 



149. Tests for Sugar, 297 



150. Quantitative Estimation of Sugar, 298 



151. Mechanism of the Digestive Apparatus, ...... 298 



152. Introduction of the Food, 298 



153. The Movements of Mastication, 299 



154. Structure and Development of the Teeth, ...... 300 



155. Movements of the Tongue, ......... 304 



156. Deglutition, 305 



157. Movements of the Stomach, ........ 309 



158. Vomiting, 310 



159. Movements of the Intestine, . . . . . . .312 



160. Excretion of Faecal Matter, 313 



161. Influence of Nerves on the Intestine, 316 



162. Structure of the Stomach, 321 



163. The Gastric Juice, 325 



164. Secretion of Gastric Juice, 326 



165. Methods of obtaining Gastric Juice, ....... 330 



166. Process of Gastric Digestion, ........ 331 



167. Gases in the Stomach, 336 



168. Structure of the Pancreas, 337 



169. The Pancreatic Juice, 339 



170. Digestive Action of the Pancreatic Juice, ...... 340 



171. The Secretion of the Pancreatic Juice, ....... 340 



172. Preparation of Peptonised Food, ..,,.... 345 



