54 PHYSIOLOGY OF MUS AND NKKVI 



point of contact, and also through the ])riniarv coil of 

 an inductive apparatus The secondary foil is con- 

 nected with the muscle. When, therefore, the lever I 

 is turned aside, the muscle is irritated. Accordingly it 

 pulsates and raises the pencil of the index so that the 

 latter marks a vertical line, representing the height of 

 elevation of the muscle, on the cylinder A. ]>y press- 

 ing the finger on #, the bayonet -shaped point I may be 

 slightly raised, the index point c bring at the same time 

 slightly removed from the cylinder. The clockwork 

 is then sei in motion. The cylinder turns, at first 

 slowly, lint gradually more quickly ; but the mu>cle 

 remains inactive, and the point can make ho mark. 

 As soon as the cylinder has attained the desired speed 

 the linger is removed; / sinks, and is soon after caught 

 and turned aside by the nose, and the muscle, thus irri- 

 tated, pulsates, and this pulsation is recorded on the 

 cylinder during its rotation. 



The irritation of the muscle being effected by the 

 apparatus itself, it occurs when the rotating cylinder 

 is in a definite position; that is to say, the evli'iid^r 

 is in that position in which the nose has ju>t touched 

 the end of the lever /. It is evident that this posi- 

 tion is the same as that at \\liich the muscle \vas at 

 t'n>t allowed to pulsate when the cylinder >t oo.l still. 

 The vertical line then drawn, therefore, indicates 

 exactly the position of the cylinder at the mom, nt at 

 which irritation, takes place. When- this vertical line 

 deviates from the hori/.oiital line first drawn is the 

 point at \\hirh the pencil \vas \\lien irritation \vas in- 

 duced in the muscle. The distance- from which the 

 periods are to be calculated must be me;i<ured from 

 this point . 



