POISON OF SOME INDIAN VENOMOUS SNAKES. ^1 



Time. Left. Eight. 



1.2 ... ... Injected a drop of concentrated solution 



of dried cobra-poison under skin of 

 back. 



1.5 ... ... It draws up legs and wipes back once or 



twice. 



Another drop. 



No reflex action in either foot. The 

 heart could not be seen beating till 

 the frog was opened ; then it was 

 found beating slowly and languidly, 

 24 in a minute. 

 2.45 ... ... Half a drop of liquor atropise placed on 



heart. Immediately afterwards its 

 pulsations became more forcible, but 

 were still 24. 



Experiment LV. 

 May 15th. — Divided the medulla of a frog about 3 P.M. 

 May loth. — Suspended it by hook through the jaws. 



One drop of slightly diluted, but stilF 

 concentrated solution of cobra-poison 

 injected under the skin of the back. 



2.23 10 14 The foot was twitched up in the acid at 



these times, but the leg was not 

 drawn up. 



3.25 150 150 No reflex action. Strong acetic acid 



causes none. Thorax opened. Heart 

 quite still. 



These experiments show that the time required for the per- 

 formance of a reflex act went on increasing, or, in other words, 

 (95) G 



