. Eight lectures on the signs of life from their electrical aspect . 10 m ins. case, that of the human skin, the congelation blaze-current is of outgoing direction. FlG. 51 (4209).—Skin of man. 2nd day after excision. Skin gradually cooled by surrounding the skin-chamber with a freezing mixture. Sudden electromotive discharge (ouigo:ng current) at a tempera- ture of - 6° inside the skin-chamber. Be- fore freezing the + responses to + and - single induction shocks were + ar>d + volt. After freezing, the + responses were absent, being replaced by small and + polarisation effects. O
. Eight lectures on the signs of life from their electrical aspect . 10 m ins. case, that of the human skin, the congelation blaze-current is of outgoing direction. FlG. 51 (4209).—Skin of man. 2nd day after excision. Skin gradually cooled by surrounding the skin-chamber with a freezing mixture. Sudden electromotive discharge (ouigo:ng current) at a tempera- ture of - 6° inside the skin-chamber. Be- fore freezing the + responses to + and - single induction shocks were + ar>d + volt. After freezing, the + responses were absent, being replaced by small and + polarisation effects. On recongela- tion no second discharge was observed. Alterations of electrical resistance occur in marked degree in connection with the electromotive effects that first attract our attention. Surviving skin as it dies exhibits a fall of resistance. There is a well-marked diminution of resistance as the im- mediate consequence of electrical excitation ; Fig. 50 incident- ally shows this. And in the course of cooling, there is first a gradually increasing resistance, then at the point of congelation a sudden increase of resistance, which in some instances is preceded by a small and evanescent diminution, not unlike a congelation blaze, which, however, I have reason to attribute to a slight rise of temperature and of conductivity occurring when the under-cooled tissue juices pass from the liquid to the solid
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