496 



Prof. J. C. Bose. Influence of Electric 



second. The pair of records (3) was taken once more under the original 

 feeble current of 1 microampere (fig. 5). The plant had by this time become 



Fig. 5. — Records obtained with an identical specimen showing (1) normal action under 

 feeble current ; (2) reversed action under strong current ; (3) normal effect once 

 more under feeble current. — > represents homodromous and ■< — heterodromous 

 current. 



slightly fatigued ; the results, however, are similar to those of the first 

 series. We have transmission once more under heterodromous current 

 (the time-interval being 20 tenths instead of 18 tenths of a second), and 

 retardation culminating in block under homodromous current. I give 

 below a tabular statement of results of typical experiments on reversal 

 under moderate current. 



Table IV. — Eeversal under Moderate Intensity of Current. 



Number. 



Intensity of 

 current. 



Transmission period 

 under hetero- 

 dromous current. 



Transmission period 

 under homo- 

 dromous current. 





microamperes 







1 



• 3 , ,;. t 



Block of transmission 



19 tenths of a second. 



2 



3-5 



>> » 



12 ;•; 



3 



4 



i> » 





4 



4 



33 33 



22 „ 



5 



4-5 



33 33 



18 



The action of a strong current induces a block of conduction under both 

 heterodromous and homodromous currents. 



