35 



PLATE II 



Arterial-pressure Observation (Exerc. V). 



Figs. 1, 2, 3, and 4, dissection for carotid and vago-sympathetic ; figs. 1, 2, and 3, on 

 r. side ; fig. 4 on 1. side. 



Fig. 1. 1st stage : k, position of top of sternum ; Sh, top of r. shoulder. Dotted black line 

 from K to top ring of trachea marks mid-ventral line of neck ; broken black line marks 

 position of median edge of sterno-mastoid muscle. 



Fig. 2. 2nd stage: Vag., vagus; St/., cervical sympathetic. 



Fig. 3. 3rd stage : vagus ligated, lifted, and electrodes applied ; Lig. vag., ligated vagus ; 

 Si/., cervical sympathetic in situ ; b, hand-electrodes. 



Fig. 4. Carotid prepared for insertion of cannula ; Vag. sy., vagus and sympathetic ; Sh., 

 top of left shoulder ; black dotted line marks mid-ventral line of neck. 



Fig. 5. Scheme of arrangement of manometer, pressure-bottle, clamps, and junctional 

 tube for connexion with the carotid artery, p, manometer ; r, float riding on Hg in distal 

 limb of manometer and carrying pen for writing on the kymograph paper ; a, clamp on 

 rubber tubing attached to top of proximal limb of manometer ; b, rubber pressure-tube attached 

 to side-branch of proximal limb of manometer ; e, clamp on rubber tube from pressure-bottle 

 D ; J, junctional rubber pressure-tube from manometer to join glass cannula (n) ligated into 

 carotid artery c ; l, clamp on junctional rubber tube near the end which will receive the arterial 

 cannula ; n, glass cannula ligated into carotid ; o, carotid artery with the three threads 1, 2, 3, 

 distal, middle, and proximal respectively ; h, heart. 



KuPTURE OF Aortic Valve (Exerc. VIII). 



Fig. 6. Diagram for experiment of rupture of aortic valve and effect on arterial pressure 

 (exerc. VIII). v, ventricle ; a, r. auricle (appendix) ; r, fat covering root of aorta ; a, aortic arch ; 

 s, sup. vena cava. 



F 2 



