UNIFORM, FATIGUE, AND STAIRCASE EFFECTS I I 5 



molecular strain. The conductivity and excitability of an 

 organ are thus diminished, and the responses undergo 

 diminution, in consequence of cumulative residual strain. 



Fatigue is greater in a motile than in a conducting organ. 

 Motile excitability disappears earlier than conductivity. 



The anomalous erection of the Mimosa leaf is brought 

 about by the combined effects of diminution of conductivity, 

 abolition of excitability, and possibly, in some instances, by the 

 subsequent excitation of the upper half of the pulvinus also. 



