Xvl ILLUSTRATIONS. 



Pig. Page 



29. The position of the lungs in the thorax 209 



30. Hering's apparatus for demonstrating the action of the respir- 



atory pump 210 



31. Diagram to show movement of diaphragm during respiration 211 



32. Position to be adopted for effecting artificial respiration 215 



33. Diagram of laryngoscope 225 



34. Position of the glottis preliminary to the utterance of sound. . 226 



35. Position of open glottis , 226 



36. The position of the tongue and lips during the utterance of 



the letters indicated 228 



37. Diagram of the uriniferous tubules, the arteries and the veins 



of the kidney (colored plate) 232 



38. Diagram of urinary system 236 



39. Schema of simple reflex arc 240 



40. Diagram of nervous system of segmented invertebrate 242 



41. The simplest reflex arc in the spinal cord 244 



42. Diagram of section of spinal cord, showing tracts '247 



43. Reflex arc through the spinal cord, in which an intermediary 



neurone exists between the afferent and efferent neurones 

 (colored plate) 247 



44. Course of the pyramidal fibers from the cerebral cortex to 



the spinal cord (colored plate) 248 



45. Under aspect of human brain 257 



46. Vertical transverse section of human brain 258 



47. Diagram of the dorsal aspect of the medulla and pons, show- 



ing the floor of the fourth ventricle with the nuclei of 

 origin of the cranial nerves (colored plate) 260 



48. Diagram to show areas of referred pain in distribution of 



fifth nerve due to affections of the various teeth (front 

 view) (colored plate) 262 



49. Diagram to show areas of referred pain in distribution of 



fifth nerve due to affections of the various teeth (side 

 view) (colored plate) 264 



50. Cortical centers in man 270 



51. The semicircular canals of the ear, showing their arrange- 



ment in the three planes of space 276 



52. Formation of image on retina 281 



53. Section through the anterior portion of the eye 282 



54. A, spherical aberration; B, chromatic aberration 285 



55. Errors in refraction 286 



56. Semidiagrammatic section through the right ear 292 



57. Diagrammatic view of the organ of Corti (colored plate) 292 



58. Tympanum of right side with the auditory ossicles in place. . 294 



59. Schema to show the course of the taste fibers from tongue to 



brain . . 296 



