. Eight lectures on the signs of life from their electrical aspect . \Experiinenti\ Year. The first seed gives, as you see, a large electromotive re- sponse. The other seeds give no response at all. The first seed is alive, the others are dead. We shall return to these I wish in this first lecture to exhibit to you two other experimental illustrations as typical of the kind of problem and argument with which we have to deal. Fig. I.âAverage electrical response of seeds of five successive years. The ordinates represent the average vol- tage of response, which, as stated in the text, is taken as
. Eight lectures on the signs of life from their electrical aspect . \Experiinenti\ Year. The first seed gives, as you see, a large electromotive re- sponse. The other seeds give no response at all. The first seed is alive, the others are dead. We shall return to these I wish in this first lecture to exhibit to you two other experimental illustrations as typical of the kind of problem and argument with which we have to deal. Fig. I.âAverage electrical response of seeds of five successive years. The ordinates represent the average vol- tage of response, which, as stated in the text, is taken as the index of vitality.* matters in a future lecture; I 5. Muscle.âMuscle is a favourite object of physiological experiment; it gives sign of life by contracting when it is stimulatedâeither directly, by stimulation of the muscle itself, or indirectly, by stimulation of the nerve that is its motor nerve. And, roughly considered, its mechanical response or contraction is measure of the degree of vitality that it possesses. No one doubts that the contraction of a muscle is sign and proof of its state of life, and that the degree of contraction and the work of which that contraction is capable, are ccBteris parihis measure * Proc. Roy. Soc, vol. Ixviii., p. 87.
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