or growth. When the intensity of stimulus was raised to
3 units, there was illtillCt‘d an actual contraction.
CUNTINUI'I‘Y BETWEEN INCII’IENT AND ACTUAL CON'I‘RAC'I‘JON.
It will thus he seen, that external stimulus of electric shock induct-s a reaction which is of Opposite sign to the normal growth elongation or expansion. We may con- veniently describe this ell'cct as ‘incipient’ contraction; for under lllUl‘t'tlHlIlg intensity of stimulus, the contractile function. opposing growth elongation, becomes more and more, pronouncml; at an intermediate stage this results in an arrest of growth; at the further stage, it culmin- m'os in an actual shortening of the organ. There is no hrvuk of continuity in all these stages. I shall, therefore, use the term ‘contraction’ in a wider sense, including the ‘incipivut’ which linds expression in a retardation of growth.
In Table XVI is gin-n the results of certain typical experiments on tho cll'oct of stimulus of increasing intcn- sity and duration.
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'r.\m.ic xv1.—~-inooct:'r or m'rszisi'n' AND DURATION or ELEU'I‘RH‘ srmmns ()N tllct‘tW'l‘ll.
l Duration of i I . ‘. . : nt -n." . '. n. i - ‘ , Appllt'illltill. j I ( 5“) 1h“ or glmml‘ I __ - _ _ _ _ l Normal 0-35 It per second. _ 5 seconds 1 unit 0-22 ,u ” n ,. 2 units (H)? 'u, ,, ,, ,. '1 n Arrest of growth. . Normal 0'30 [1. per second. (‘ontinnons stnnu- (in) unit 0-20 F ” ” ' lation ; , l . ' ! ’, ; .‘l 9, no. I ,1 ,, E ,, . .5 ,. ‘ (.ont ‘actlon.
