Mo to- excitability in Mimosa . 773 
responsive movement was in this case available, yet the amplitude of 
successive responses is seen to undergo continuous diminution. 
Fig. 13. Evening record from 6 to io p.m., showing gradual depression of excitability. 
Record in the morning. The excitability is, as we have seen, nearly 
abolished about 8 or 9 a.m., after which there is a gradual restoration. 
This gradual enhancement of excitability to a maximum in the course of the 
forenoon is seen well illustrated in the following record (Fig. 14). 
Fig. 14. Morning record from 8 a.m. to 12 noon, exhibiting gradual enhancement of excitability. 
The record of daily periodicity given in Fig. 11 may be regarded as 
a typical example. Modifications may, however, be observed which are 
3 G 
