Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 LECT. v.] ELECTRICAL ORGANS 77 exciting current; positive polarisation is in the same direction as the exciting current. These four stages are reducible to two, by omission of Type IL (variety below Type I.) and of Type IIL (variety The response is absolutely The response is absolutely and relatively positive. and relatively negative. fiH 5f^ 1[ PpnBmnn^ m w ,^^ The response is absolutely positive and relatively negative. Fig. 34.—Du Bois-Reymond's diagra
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 LECT. v.] ELECTRICAL ORGANS 77 exciting current; positive polarisation is in the same direction as the exciting current. These four stages are reducible to two, by omission of Type IL (variety below Type I.) and of Type IIL (variety The response is absolutely The response is absolutely and relatively positive. and relatively negative. fiH 5f^ 1[ PpnBmnn^ m w ,^^ The response is absolutely positive and relatively negative. Fig. 34.—Du Bois-Reymond's diagram (^Aix/iiv, 1885, p. 121) to illustrate the electrical response to electrical excitation of a strip of the electrical organ of Torpedo. The direction of the normal organ-discharge is supposed to be upwards, so that the first two responses of the upper line are homodrome in relation to the exciting current; the next two responses and all four responses of the lower line are antidrome. above Type IV.). We thus have Type L as the characteristic response of the living organ, and Type IV. as that of the dead organ. This—if you will carefully read du Bois' description, and clearly appreciate the significance of his terminology— is the essential pair of features that respectively characterise the living and dead states of an electrical organ—it discharges in a direction of its own while it is alive; after death, it exhibits the ordinary polarisation of a non-living electrolyte.
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