THE PROG, AND OH THE ACTION OP THE VAGUS NERVE. 1033 
Fig. 9. June 20, 1881. Toad. Stimulation of vagus. Sec. coil at 10 centims. 
Fig. 10. April 11, 1881. Toad. Stimulation of vagus. Sec. coil at 5 centims. The 
ventricle was unable to register the maximum of its contractions, as the 
upper and lower levers came in contact. 
Fig. 11. March 1, 1881. Frog. Curve B. Stimulation of vagus. Sec. coil gradually 
pushed from 15 to 8 centims. 
Fig. 12. March 15, 1881. Frog. Stimulation of vagus. Sec. coil at 5 centims. 
Auricular beats only shown. Curve B is the continuation of curve A, except 
that the vagus was stimulated between the two curves. 
Fig. 13. March 10, 1881. Frog. Stimulation of the vagus. Sec. coil at 10 centims. 
Fig. 14. May 12, 1881. Toad. Stimulation of vagus. Sec. coil at 8 centims. Ven¬ 
tricle beating once to every 3 auricular beats. 
Fig. 15. April 11, 1881. Toad. Stimulation of vagus. Sec. coil at 10 centims. 
Fig. 16. Feb. 25, 1881. Frog. Stimulation of vagus. Sec. coil at 8 centims. Con¬ 
tractions of base of ventricle, upper curve; of apex, lower curve. 
Fig. 17. March 17, 1881. Frog. Curves A, B, C, D. Series of curves to show effect 
of vagus stimulation, when the ventricle is rendered quiescent, by heating 
the auricles and sinus. 
Fig. 18. June 6, 1881. Toad. Stimulation of vagus. Sec. coil at 7 centims. Clamp 
tightened so as to render ventricle quiescent. 
Fig. 19. May 9, 1881. Frog. Stimulation of vagus. Sec. coil at 9 and 8 centims. 
Ventricle beating with alternately strong and weak contractions. Inter¬ 
mediate part of the curves indicated by the dotted lines. 
Fig. 20. Feb. 23, 1881. Apex and base of ventricle. Apex beating with alternately 
weak and strong contractions. Base upper, apex lower curve. 
Fig. 21. June 16, 1881. Frog. Secondary rhythm in the alternately strong and weak 
contractions of the ventricle. 
Figs. 22 and 23. Apparatus as described on page 1019. 
Fig. 24. Nov. 4, 1880. Toad. Stimulation of the vagus. Sec. coil at 6 centims. 
Heart in modified Bov’s tonometer. Pressure of blood solution 5 centims. 
Fig. 25 A and B. Nov. 4, 1880. Stimulation of vagus. Sec. coil at 4 and 3 centims. 
Pressure of blood solution 28 centims. in A, 29 centims. in B. 
Fig. 26. May 19, 1881. Frog. Curve A. Muscarin sulphate, 5 per cent, solution 
applied to the ventricle at the point marked by an arrow. Upper curve 
auricle, lower curve ventricle. Curve B. Atropin sulphate, 1 per cent, 
solution applied at arrow to the auricles and sinus only. Upper curve 
ventricle, lower curve auricle. Curve C. Atropin sulphate applied to 
ventricle at the arrow. Upper curve ventricle, lower curve auricle. 
Fig. 27. July 16, 1881. Toad. Stimulation of vagus. Sec. coil at 10 centims. 
Muscarin sulphate, 5 per cent, solution had been applied to the auricles and 
sinus only. 
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