474 BOTANICAL GAZETTE [JUNE 
among the shrubs, Chamaedaphne exhibits the lowest rate of tran- 
spiration. Herbaceous plants in general show a higher rate of 
transpiration than shrubs, while trees usually have a lower rate. 
Among plants that may be exposed to winter conditions, evergreen 
trees and shrubs transpire at a lower rate than deciduous trees and 
shrubs. 
°. view of potted pees and cuttings in the course of a transpiration 
experiment disring a hot wave; July 2, 1912 
Rate of conduction 
For use in these experiments cuttings were made in the evening 
after the stomates had closed, and kept under laboratory condi- 
tions over night, where the sun could strike them in the early 
morning, after which the experimentation was carried on as 
usual. Consequently, the results are not maximum rates of 
conduction, but relative rates of different species under similar 
conditions. In the summary of this work (table V), each set of 
