TRANSPIRATION BEHAVIOR OP RAIN-FOREST PLANTS. 



67 



Inasmuch as the absolute transpiration rate is of minor significance 

 when considered independently of the concurrent rate of evaporation, 

 the entire subject of the amplitude of the fluctuations of transpiration 

 in each species, and the comparative rates of different species, will be 

 taken up in the discussion of their relative transpiration rates. Suffice 

 it to give here some of the extremes of absolute transpiration, con- 

 sidered entirely apart from the rates of evaporation by which they were 

 accompanied (table 21). 



Table 21, — Extreme rates of absolute transpiration for unit time and area. 

 Milligrams per hour per square centimeter. 



Table 22. — Comparative rates of transpiration and relative transpiration in jive species. 



Transpiration amounts are the average hourly loss per square centimeter for the 

 number of readings stated. 



