SALIVAKY SECKETION 79 



supine, and the heart, lungs, and trachea are removed from it. This can be 

 suitably done with a large strong pair of scissors thus : Standing on the 

 right side of the carcase, pick up with the left hand a fold of skin over the mid- 

 line of the lower part of the sternum and lift the wall of the thorax, and with 

 the scissors in the right hand cut open the upper part of the abdomen by a 

 cut transverse to the mid-ventral line just below the xiphoid of the sternum. 

 Carrying the cuts with the scissors well lateral and then headward through 

 the ribs both to right and left, expose the contents of the chest without 

 injuring them. Lifting up the flap so made in the ventral wall of the chest, 

 extend the flap into the base of the neck through the first ribs and clavicles. 

 The heart, lungs, and trachea have thus been laid bare. Cut the trachea 

 across below the place of insertion of the tracheal cannula. Grasping the upper 

 end of the trachea with the left hand and lifting it, free it by tearing the loose 

 connective tissue, assisting with a few cuts with the scissors ; follow the 

 viscera down into thorax and free similarly the lungs and heart entirely, 

 taking care not to injure the lungs. Cut the venae cavae and aorta. Remove 

 the trachea, lungs, and heart so freed ; probably a length of the oesophagus is 

 attached to them ; this can be stripped from them. 



Remove from the upper tubulure of bottle a the cork with its two glass 

 tubes. Draw the upper end of the trachea over the lower end of the glass 

 tube unprovided with rubber and clip, and secure the trachea to it by a strong 

 ligature, tying at the constriction. Lifting the lung-heart preparation by the 

 cork with the left hand, push the heart gently through the upper tubulure of 

 bottle A and then the lungs, and reinsert the cork into the tubulure. The 

 lungs are collapsed and hang with the heart in the bottle. Close the clip on the 

 rubber tube of the other glass piece passing through the cork. 



Bring the other pressure-bottle over the table-edge and lower it to about 

 30 cm. below bottle a. As the water runs out of a into the other bottle the 

 lungs expand. Note the manner of their unfolding. 



ANNOTATION 



Ohs. 54-7. Salivary ecretion is a la physiol. et la path, du systhne nerveux, 

 striking instance of secretion under nervous tome ii, p. 146; Paris, 1858), and he first called 

 control. The secretory action of corda attention to the concomitant vasodilatator 

 tympani was first shown in the mixed action of the nerve on the gland [Journ. de 

 lingualis-corda nerve (in the dog) by C. Lud- la Physiologie, tome i, p. 651 ; Paris, 1858). 

 wig (1851, Mitth. d. naturforsch. Gesellsch. z. He had previously discovered (1851) vasocon- 

 Zurich, No. 50) ; CI. Bernard definitely strictor nerves. For corda-secretion in the sub- 

 traced the effect to the corda tympani (1858, maxillary of the cat, refer to J. N. Langley, 

 Compt. rendus, Paris, Jan. 28 ; Lecons sur Jnl. of Physiol, vol. i, p. 86, 1878 ; vol. vi, 



