RESPIRATION'. 



8 9 



attachment. Its general position is shown in Figs. 38, 40, 

 and 43. 



To show the Action of the Diaphragm and Lungs. MATERIAL. 

 Bell jar with stopper, sheet of rubber large enough to cover the mouth 

 of the jar, toy rubber balloon, cork (rubber preferred), glass tube, strong 

 rubber band (such as boys use for slung shots), marble. 



Triangularis Sterni 

 Internal Mammary Vessels v. 



Left Phrenic 

 Nerve 



Pleura 

 Puimonalis 



Pleura Costalis 



Mediastinum \ Sympathetic Nerve 



( Thoracic Duct 



Vena Azygos Major I p osterior 

 , Pneumogastric Nerves ) 



Fig. 41. A Transverse Section of the Thorax, showing the Relative Position of the 

 Viscera and Reflections of the Pleurae. 



PREPARATION. Lay the marble on the center of the sheet of rub- 

 ber, double the rubber over it, stretching the rubber strongly over the 

 marble, and tie the marble firmly in its place. Stretch the sheet of 

 rubber over the mouth of the jar with the projection made by the marble 

 on the outside, and fasten with rubber band. Bore a hole in the cork, 



