. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. THE SIGNS OF LIFE [lect. do not know beforehand whether it is aHve or dead (but which I believe to be dead as it dates from the year i860). And at the end of this lecture, if you care to see the trial, I will test some very old seeds indeed, that were given to me by Mr Percy Newberry, who combines the qualifications of botanist with those of Egyptologist. They are seeds collected by himself, and placed by him as dating from the twelfth dynasty, , as being something like 4400 years old. I need hardly say
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. THE SIGNS OF LIFE [lect. do not know beforehand whether it is aHve or dead (but which I believe to be dead as it dates from the year i860). And at the end of this lecture, if you care to see the trial, I will test some very old seeds indeed, that were given to me by Mr Percy Newberry, who combines the qualifications of botanist with those of Egyptologist. They are seeds collected by himself, and placed by him as dating from the twelfth dynasty, , as being something like 4400 years old. I need hardly say that no such un- doubtedly old seeds will give any electrical response, nor will they germi- nate. I have previously made both tests. Voib â¢oiao â 0/00 â¢003O. \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. Please note that these images ar
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