ILLUSTRATIONS XXIX 



FIG. PAGE 



133. Quantitative record of breathing air through a tube 260 cm. long and 2 cm. 



in diameter 383 



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



hemoglobin or blood 394 



135. Barcroft's differential blood gas manometer 394 



136. Barcroft blood gas manometer 395 



137. Typical dissociation curve. (Color Plate.) 396 



138. Average dissociation curves 397 



139. Degree of variation in dissociation curve of man 398 



140. Dissociation curves of human blood 399 



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



fluenced by temperature and tension of CO 2 400 



142. Curve of CO 2 tension in blood 405 



142. CO 2 tension at various altitudes 417 



143. Cells of parotid gland showing zymogen granules 454 



144. Parotid gland of rabbit in varying states of activity examined in fresh state 454 



145. Diagrammatic representation of the innervation of the salivary glands in the 



dog. (Color Plate.) 458 



146. Pancreatic acini stained with hematoxylin 462 



147. Three preparations of pancreatic acini stained by eosin orange toluidin blue 463 



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



stomach by a double layer of mucous membrane 468 



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



on mastication of palatable food for 20 minutes 471 



150. Cubic centimeters of gastric juice secreted after diets of moat, bread, and milk 475 



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 .... 475 



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 477 



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 swal- 

 lowing 480 



154. Schematic outline of the stomach 486 



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



after feeding a cat with food impregnated with bismuth subnitrate . . 487 



156. Skiagrams of human stomach at intervals after food, illustrating a gastric 



cycle 488 



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



in three differently colored portions 489 



158. Tracings showing the relationship between contractions of the antrum (lower 



tracing) and the pyloric sphincter (upper tracing) 492 



159. Diagram of the relationships of the contractions of antrum, sphincter, and 



t duodenum, and the passage of chyme from antrum to duodenum . . . 493 



160. Apparatus for recording contractions of the intestine 498 



161. Diagrammatic representation of the process of segmentation in the intestine 499 



162. Intestinal contractions after excision of the abdominal ganglia and section of 



both vagi t 500 



