PLATE XCIV. 



Fl(J. 244. Tracing (after Schmiedel>erg) showing the effect of electrical stimulation of the vagus of .1 frog under 

 tlie influence of nicotin. The line ending in asterisks indicates the duration of the period of excitation 

 (i 81). 



FIG. 243. Dissection of in- 

 ferior cervical ganglion of 

 rabbit. The pectoral mus- 

 cles aud sterno-clavicular 

 ligament have been divided, 

 and other more superficial 

 parts removed. The dotted 

 line indicates the middle line 

 of the body, g I, A lym- 

 phatic gland in contact with 

 the apex of the lung ; a *, 

 sub-clavian artery ; aw, ver- 

 tebral artery ; ". vagus nerve ; 

 *, sympathetic ; p, phrenic 

 ( 81). 



FIG. 246. Respiratory mus- 

 cles of frog (after Ecker), 

 suit, submentalis ; ;/ h, ge- 

 niohyoideus ; h g, hyo- 

 glossus ; I m, snlmiax illaris ; 

 tin", anterior honi of the 

 hyoid bone ; p h, petrohy- 

 oidei ; oh, omohyoideus; 

 t h, steruoliy oldens. 



.y* 



FIG. 247. Recording Stethometer. 



A, Tympanum ; B, ivory knob; B'rod 

 which carries the knob opposed to 



B, C t T-tube, by which A communi- 

 cates, on the one hand with the re- 

 cording tympanum, on the other with 

 an elastic bag D. The purpose of the 

 bag is to enable the olwerver to vary 

 the quantity of air in the cavity of 

 the tympana at will. The tube lead- 

 ing to it is closed by a clip when the 

 instrument is in use. ( Pq). 



