Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlecturesons00wall Year: 1903 VII.] DIRECT EFFECTS 117 In surgical practice it is a very common proceeding to accelerate the recovering of a raw surface by 'skin-grafting.' It is essential that such grafts should include cells of the malpighian layer. All these things point to an exceptional vitality of cutan- eous or rather subcutaneous malpighian elements. I find that in the skin of persons dying suddenly in other- wise good health, .the cutaneous blaze-currents persist for several days, where
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect . eightlecturesons00wall Year: 1903 VII.] DIRECT EFFECTS 117 In surgical practice it is a very common proceeding to accelerate the recovering of a raw surface by 'skin-grafting.' It is essential that such grafts should include cells of the malpighian layer. All these things point to an exceptional vitality of cutan- eous or rather subcutaneous malpighian elements. I find that in the skin of persons dying suddenly in other- wise good health, .the cutaneous blaze-currents persist for several days, whereas the skin taken from ordinary post-mortem room subjects, having died gradually and completely, exhibits little or none of this sign of life twenty-four and forty-eight hours post mortem. Let me remind you of the nature of this sign, for the questions to which it may serve as an indicator are by no means exhausted. A piece of living skin set up between electrodes, and tested in the usual way by induction currents of both directions, responds by blaze-current in one — the outgoing direction. A piece of dead skin does nothing of the kind, but gives, if anything, small polarisation counter-currents. And since living skin responds in one direction to both directions of excitation, you may (observing due reservation and pre- caution) obtain outgoing blaze-currents after tetanisation by alternating currents in both pairs of directions. Here are galvanometric records of the electrical responses of surviving human skin, and of the same skin, killed by heat. 0-0010, voit. Time TTTTTTT Dead. •Living: FlG. 49 (4201).—Skin of breast 8 hours after amputation. Living.—Two + responses to single break induction shocks in + and -- directions. 8 L. 10,000. Dead.—Several - and + effects to + and - shocks, , polarisation. Resistance diminished.
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