48 ON THE NATUllE AND ACTION OF THE 



1.7. Exposed both sciatics of No. 1, and irritated tlifein by an 

 induced current. 



Left leg. Coil at 0. No contraction. 



Right leg. Coil at 17*5. Movement of toes. 



The muscles of both legs twitch well when irritated by single 

 shocks (coil at 17*5), except those in the middle of the inside 

 of the left thigh, near the place to which the point of the 

 syringe had penetrated. These muscles contract when the coil 

 is at 3. 



1.13. The muscles of the hip of No. 2 twitch distinctly when 

 irritated by single shocks, coil at 24. 



The toes move distinctly when the sciatic is irritated ; coil 

 at 37. 



1.15. The ventricles of the heart of No. 1 are firmly con- 

 tracted and motionless. The auricles are still pulsating 

 vigorously. 



The ventricles of the heart of No. 2 are only moderately 

 contracted, and there is no pulsation either in them or the 

 auricles. 



1.22. The toes of the right leg of No. 1 move when the 

 sciatic is irritated, coil at 18. 



Those of No. 2 do so, coil at 37. 



Put the electrodes in the cervical part of the spinal cord of 

 both guinea-pigs, and irritated it by an induced current, coil 

 at 0. No contraction took place in the hind legs of either 

 animal. Contractions occurred in the muscles of the fore legs 

 with much the same force in both. 



1.45. On irritating the muscles by single induced shocks : — 

 left leg of No. 1, vastus externus contracts, coil at 9*5 ; rectus 

 femoris, a pale muscle, 12*5. 



No. 1. Eight leg, vastus 15'5, rectus 25. No. 2. Eight leg, 

 vastus 11, rectus 15. 



1.53, No. 1. Left leg, vastus at 16 ; right leg, vastus at 20. 

 No. 2. Left leg, vastus at 20 ; right leg, vastus at 20. The 

 vastus contracts rather more strongly in the right leg of No. 1 

 than in those of No. 2. 



2.23. No. 1. Left leg, vastus at 4; right leg, vastus at 11. 

 No. 2. Left leg, vastus at 11 ; right leg, vastus at 11. 



