Electro-physiology (1896-98) Electro-physiology electrophysiolog02bied Year: 1896-98 xr ELECTRICAL FISHES •115 medial to the lateral wall of the organ of Torpedo, it is quite clear why there should, in the fish in air, he a current as stated by Colladon and Matteucci between median and lateral points, from former to latter on the back, and vice versa on the belly. If all the columns were of equal height in both organs, the organs being, moreover, brought together in the median plane, and there united, the centre of the median line would be most positive on the dorsal aspect, most negative on
Electro-physiology (1896-98) Electro-physiology electrophysiolog02bied Year: 1896-98 xr ELECTRICAL FISHES •115 medial to the lateral wall of the organ of Torpedo, it is quite clear why there should, in the fish in air, he a current as stated by Colladon and Matteucci between median and lateral points, from former to latter on the back, and vice versa on the belly. If all the columns were of equal height in both organs, the organs being, moreover, brought together in the median plane, and there united, the centre of the median line would be most positive on the dorsal aspect, most negative on the ventral. :' On separating the organs again, the most positive and most negative points in each organ would—-as du Bois-Eeymond pointed out— FIG. 270.—Schema of current distribution outside the body of Torpedo. (Du Bois-Reyraoml.) (in correspondence with the distance between the organs) lie mid- way between the median edge and the centre.' There would thus—at equal height of all the columns—be a between back and belly in the same direction, although weaker. Reduced height of columns towards the sides, on the contrary, sends the points of greater positivity and negativity to the median border of the organ. There are thus, as du Bois-Reyrnond pointed out, currents in the back of Torpedo from these borders also to the median line, and vice versa in the belly. The accompanying Fig. 270 shows the direction of the lines of currents in a diagram of the fish, after du Bois-Reyniond. Here we see that the curves ' not merely radiate from the so-called polar surfaces, but also cut
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