( vii. ) 



Figs. 15, 10, 17. 



Diagrams showing the direction and result of action of 

 the long and short extensors on the basium. 



Fk;. is. 



A knife pressed between the segments of the basium, 

 as indicated, produces the same weakening as the con- 

 tractions of the extensors. 



Fio. 19. 



Copy of tracing showing contraction of the combined 



tendon of the extensors. Notice the double element in 



the curve. 



A = Point of stimulation- 



Fig. 20. 



Copy of superimposed tracings of reflex contractions 

 of the extensors Notice the difference in the latent 



periods. 



(1) = Long extensor. 



(2) = Short extensor. 



A = Point of stimulation. 



