50 ON THE BLAZE-CURRENTS OF VEGETABLE TISSUES. 
These two observations were taken on a young pea; the next 
is on an old pea :— 
Before. After. 
Between A and B ......... 95 100 
» BandC......... 75 80 
» A and C ......... 75 75 
The conductivity is increased at the anode and at the kathode, 
more so at the former than at the latter. 
| i UJ. db 
E I I E 
$37. Experiment on a geranium-stalk to see whether the 
alteration of resistance affects the substance as well as the skin, 
whether it is interpolar as well as polar.— Deflection by -hth volt 
through II before and after tetanisation through E E: 
Before Exe. After Exc. 
II .........e- 2:5 65 
EE ................- 15 50 
i. e., the interpolar region I I is affected by the excitation through 
E E; the alteration is not an exclusively polar effect. 
The effect of excitation II upon the resistance EE is, of course, 
much less pronounced : 
Before Exc. After Exc. 
II sesers 1:75 12 
EE ............... 25 2 
