INORGANIC RESPONSE 145 
In connection with the action of chemical reagents 
the following points are noteworthy. 
(1) The effect of these reagents is not only to increase 
or diminish the height of the response-curve, but also 
to modify the time relations. By the action of some 
(a) 
(b) 

Fic. 93.—‘ MoLtecunarR ARREST’ BY THE AcTION oF ‘ Porson’ 
In each, curves to the left show the normal response, curve to the right shows 
the effect of poison. In (a) the arrest is evidenced by prolongation of period 
of recovery. In (0) there is no recovery. 
the latent period is diminished, others produce a pro- 
Jongation of the period of recovery. Some curious 
effects produced by the change of time relations have 
been noticed in the account given of diphasic variation 
(see p. 113). 
