in; 



A MONTANE RAIN-FOREST 



Bhows a niaxiimim of the daily relative transpiration at 10 a. in., the 

 maximum f or evaporation and transpiration at 12 noon, and the maxi- 

 mum of stomatal aperture at 2 p. m. Between 10 and 12 a. m. there 

 was a pronounced increase in the stomatal openness, which was accom- 



Fig. 17. Curves for simultaneous experiments with Peperomia turfosa (upper) and Pilea nigres- 

 cens (lower) which determination was made of transpiration (T), relative transpiration 



( ), stomatal area (S),and evaporation ( 



E 



-J- 



10' 



panied by a plateau in the curve of relative transpiration. Between 

 12 and 2 p. m. there was a considerable fall in the relative rate at the 

 same time that the stomatal aperture was still increasing. The curves 

 for Pilea show a general similarity to those for Peperomia : there is the 



