TO 



Observations upon the Motion of 

 Fig,u 



If a terminal subleaflet be pinched 

 with forceps, or cut with scissors, it 

 rises, together with its fellow ; then the 

 .next pair rise ; then the next ; and so 

 on in succession, till all the pairs of 

 subleaflets upon the same subpetiole 

 are folded. In a little time afterwards, 

 the petiole is bent downwards at its 

 intumescence ; and in a few seconds 

 more the remaining leaflets upon the 

 same petiole fold their subleaflets in 

 pairs, from the base towards the point 

 of the leaflet. 



If a subleaflet be burnt, instead of 

 being cut or pinched, the phenomena 

 above described occur more rapidly: 

 and after they have taken place, the 

 adjoining leaves upon the same branch 

 are bent down in succession, their leaf- 

 lets brought together, and their sub- 

 leaflets folded. If the plant be very 

 vigorous and lively, an impression 



Fig. 2. 



