ILLUSTRATIONS XXIX 



FIG. PAGE 



133. Quantitative record of breathing air through a tube 2GO cm. long and 



2 cm. in diameter 374 



134. Barcroft's tonometer for determining the curve of absorption of oxygen 



by hemoglobin or blood 381 



135. Barcroft's differential blood gas manometer 381 



130. Barcroft blood gas manometer 382 



137. Typical dissociation curve. (Color Plate.) 382 



138. Average dissociation curves 384 



139. Dissociation curves of hemoglobin 385 



140. Dissociation curves of human blood 386 



141. Curves showing relative rates of oxidation and reduction of blood as 



influenced by temperature and by tension of CO 2 387 



142. Curve of CO, tension in blood 392 



143. Cells of parotid gland showing zymogen granules 419 



144. Parotid gland of rabbit in varying states of activity examined in fresh state 419 



145. Diagrammatic representation of the innervation of the salivary glands 



in the dog. (Color Plate.) 422 



146. Pancreatic acini stained with hematoxylin 427 



147. Three preparations of pancreatic acini stained by eosinorange toluidin blue 428 



148. Diagram showing miniature stomach separated from the main stomach by 



a double layer of mucous membi'ane 434 



149. Typical curve of secretion of gastric juice collected in 5-minute intervals 



on mastication of palatable food for 20 minutes 437 



150. Cubic centimeters of gastric juice secreted after diets of meat, bread, 



and milk 440 



151. Digestive power of the juice, as measured by the length of the protein 



column digested in Mett's tubes, with diets of flesh, bread, and milk . 441 



152. Loop of intestine after tying off the portions, cutting the nerves running to 



the middle portion and returning the loop to the abdomen for some time 442 



153. The changes which take place in the position of the root of the tongue, 



the soft palate, the epiglottis and the larynx during the second 



stage of swallowing 446 



154. Schematic outline of the stomach 452 



155. Diagrams of outline and position of stomach as indicated by skiagrams 



taken on man in the erect position at intervals after swallowing food 

 impregnated with bismuth subnitrate 452 



156. Outlines of the shadows cast by the stomach at intervals of an hour each 



after feeding a eat with food impregnated with bismuth subnitrate . . 453 



157. Section of the frozen stomach (rat) some time after feeding with food 



given in three differently colored portions 455 



158. Outlines of shadows in abdomen obtained by exposure to x-rays 2 hours 



after feeding with food containing bismuth subnitrate 458 



359. Curves to show the average aggregate length of the food masses in the 



small intestine at the designated intervals after feeding 459 



160. Apparatus for recording contractions of the intestine 464 



161. Diagrammatic representation of the process of segmentation in the intestine 465 

 162. Intestinal contractions after excision of the abdominal ganglia arid 



section of both vagi 466 



