^92 Dr. A. D. Waller. 



4- a 6 



Frog atropinised by repeated injections into the dorsal ljmph-sac of a 1 per 



cent, fresh solution of atropine sulphate. 

 1st nerve-skin preparation put up 2 hours later. Initial skin-current = — 0"003O 

 volt. Tetanisation of sciatic nerve by Berne coil at 1000 units for 15 seconds 

 at intervals of 10 minutes. Series of ingoing effects. 



Time 10 20 30 40 50 60 min. 



Effects. -0 0040, 0-0020, 0-0015, 0-0013, O'OOll, 00011, 0-0010 volt. 



In the first three responses of the upper line the galvanometer was shunted ; 

 in the next four responses of the lower line the galvanometer was unshunted. 



Eesponse of Frog's Skin to Indirect Excitation. 



VoU 



.02 



-01 



Type I. — Outgoing or positive response. 



