xii THE ENGINES OF THE HUMAN BODY 



PAGE 



41. Part of the duodenum, with pancreas and bile duct . . . 200 



42. Section a across a part of the wall of the small bowel showing 



the structure of a villus ; the tubular glands and lining epi- 

 thelium are also represented 205 



43. Shadow of the great bowel twenty-four hours after a bismuth 



breakfast 208 



44A. The caecum covered by its outer or peritoneal coat . . .212 

 44B. The caecum, appendix, and ileo-caecal orifice laid open . .212 



45. (A) The brain and spinal cord exposed from the right side ; 



(B) The brain stem, showing the origin of the cranial nerves ; 



(C) Section across the spinal cord showing the manner in 

 which the spinal nerves arise by two roots .... 236 



46. Plan showing the corresponding elements in a telephone and 



in a nerve system. (A) Unit of a telephone system ; (B) Unit 



of a nerve system . . . . . . . . -255 



47A. The arrangement of two units in an exchange of a telephone 



system 258 



47B. The arrangement of two units of an exchange in the nerve 



system 258 



