384 



M'Dowall 



1. If the muscles are kept stretched they retain their excitability for 

 a much longer time than when unweighted. 



Fig. 4. — Ordinates showing the extent of contraction in response to single 

 induction sliocks of varying intensity. 



a, 000 Kronec'ker units. 

 6, 1000 ,, 



c, 2000 

 rf, 3000 



e, 4000 Kronecker units. 



f, 5000 



g, 600<3 



Fig. 5. — Curves showing the extent of contraction in response to rapidly repeated stimuli 

 of varying intensity. The numbers below each curve indicate the numbers of units 

 on a Kronecker coil. 



2. Muscles which have been removed from the body remain excitable 

 longer than those which are left in situ. 



3. On stimulating the w^eighted muscle, it passes fairly quickly (after 



