OF THE ELECTRICAL ORGAN OF TORPEDO MARMORATA. 
531 
Strip of Tissue from Large Torpedo. 
Secondary coil, 0 cm. ( + ) G. T V 
99 
9 9 
99 
99 
99 
Closure. 
,, ,, ,, ( + ) G. without shunt - 03"-'07" + 65 
„ „ ( + ) „ » •03"-'05" + 30 
„ „ ( + ) „ » ■03"-07" + 45 
Strip of Tissue from large vigorous Torpedo. Five Groves in Circuit of 
Primary Coil. 
Closure. Alternate 15" closure. 
Secondary coil, 0 cm. ( + ) G. T \j . '003"—15'' . . + co 
„ . 30”-45" . . +240 
„ . 60"-75" . . + 112 
„ . 90"-105" . . + 60 
„ . 120"-135" . . + 40 
Closure. 
„ ( + ) G. all in . . . -03"-05" + 200 
, ( + ) „ ’05"-07" + 65 
„ ( + ) „ ... •03"--05" +190 
„ ( + ) „ . . . -05"--07" + 105 
If we attempt to get still nearer in time to the excitation, and ascertain if a response 
is perceptible during such intervals as 0" to '01" and '01" to '02" after the passage of 
the induction shock, this induction shock itself becomes perceptible. The only method 
of getting such information is thus to compare the relative deflections produced by the 
passage through the experimental circuit of ( + ) and (—) induction shocks respectively. 
If the excitation effect is present during the first two hundredths of a second, it must 
add to the ( + ) and diminish the (—) deflection. This DU Bois-Reymond has done, 
and he finds that the ( + ) induction current is considerably greater than the (—) one. 
This, he says, cannot be explained, and is a case of “ irreciprocal conduction.” A 
simpler explanation, and one more in accordance with present knowledge, seems to be 
indicated by the above considerations, and would be supported here, were it not for 
the astonishing circumstance that no evidence was furnished by our experiments of 
there being in the conditions under which we worked any such remarkable difference 
between the apparent strengths of the ( + ) and (—) induction currents. It is not 
stated in du Bois-R,eymond’s experiments whether he cut off the after-effect which 
follows the passage of the induction current by closing the galvanometer circuit only 
up to '05" after the shock. If he did not do so, the full after-effect must obviously be 
3 y 2 
99 : 9 
9' 9) 
9 9 9,9 
9 9 9 9 
Five Groves in Circuit of Primary Coil. 
+ 310 
+ 150 
+ 80 
+ 45 
+ 25 
+ 8 
r 15' 
readings. 
