1907. | Innervation of Antagomstic Muscles. 57 
encroaches on the phase of inhibitory relaxation during the period of actual 
delivery of the external stimulus. 
Further, with these stimuli other conditions governing the appearance and 
intensity of the contraction-phase become apparent. Of these, one is that a 
TOOT oO TOTTOIM wy 
weak stimulus which, when brief, does not occasion a contraction-phase, does 
induce a contraction-phase if its duration be lengthened (fig. 4). Also, a 
stimulus which, when brief, occasions but slight contraction-phase, occasions 
IEtGs) a: 
more and more marked contraction-phase when its duration is more and more 
lengthened, up to certain limits. That it is less easy to evoke the diphasic 
