156 GENERAL PROPERTIES OF LIVING TISSUES 



soon as this contraction is well under way, make 

 the constant current. 



The anodal half of the muscle will show a dis- 

 tinct relaxation ; the cathodal half will not relax, 

 but may even contract a little more. 



STIMULATION AFFECTED BY THE FORM OF THE 

 MUSCLE 



Connect a dry cell through a simple key to 

 the metre posts of the rheochord. Bring wires 

 from the non-polarizable electrodes to the positive 

 post and the slider, interposing the pole-changer 

 with cross- wires so that the direction of the cur- 

 rent can be changed. Place the slider against 

 the positive post, so that all the current passes 

 back to the cell. 



Prepare a curarized sartorius muscle with its 

 bony attachments. Fasten the pelvic fragment 

 in the muscle clamp. Tie a thread about the 

 tibia and fasten the thread to the upright pin of 

 the muscle lever. Let the. cathode rest on the 

 tibial end of the muscle, the anode on the pelvic 

 end ; the current will then be descending. Move 

 the slider a few centimetres away from the posi- 

 tive post, and make the current. If no contrac- 

 tion follows, move the slider farther along, arid 

 make the current again. 



With careful work, it will be shown that with 



