Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 50 THE SIGNS OF LIFE [LECT. and equal deflection to the left. There is no blaze. The eye- ball is dead, or in that state of latent life, or temporary non- living state to which we give the name of ' shock.' Evidently, 10 m. FlG. 22.—Frog's eyeball, induction coil and galvanometer in series. Effects of single break induction shocks in positive and negative directions before and after ' electrocution ' by strong tetanisation. as regards the retina, or the eyeball, the blaze reaction is a very
Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 50 THE SIGNS OF LIFE [LECT. and equal deflection to the left. There is no blaze. The eye- ball is dead, or in that state of latent life, or temporary non- living state to which we give the name of ' shock.' Evidently, 10 m. FlG. 22.—Frog's eyeball, induction coil and galvanometer in series. Effects of single break induction shocks in positive and negative directions before and after ' electrocution ' by strong tetanisation. as regards the retina, or the eyeball, the blaze reaction is a very nice and convenient '•'sign of life' § 30. The three types.—So far, the several experiments that have been grouped together under the head of the third experi- ment (| 26), have come off perfectly well, and, in accordance, with expectation and prediction. It might have been otherwise. I took care to be provided with fresh, normal, uncompressed eyeballs, because I did not wish, in introducing the subject, to have to confuse your first im- pression of it by interpolated explanation of unexpected results of experiment. And I was careful to be provided with the lively Rana Tcinporaria, as the sluggish R. csculenta would pro- bably not have answered as well. Nevertheless, I felt it neces- sary to have at my elbow a diagram, in which are schematically summarised the various cases that I have met with in various states of the eyeball. I have divided them into three types:—
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