Transpiration of Evergreen Trees in Winter. 



By 

 Shunsuke Kusano, RigaTiusld. 



With Plate XVIII. 



I. Introductory. 



It is well known, from the researches of previous investi- 

 gators, that evergreen trees in temperate climates can transpire 

 even in the midst of winter. But as no such investigations have 

 been undertaken with regard to plants indigenous to Japan, it has 

 seemed desirable that efforts should be made to ascertain certain 

 numerical values relating to the absorption of water by the roots 

 of such plants and the evaporation of it from their leaves, during 

 winter. 



Almost all the investigations with regard to transpiration, 

 made up to the present time, by an enormous number of authors^^ 



1) A fuller account with regard to transpiration is to be found in Burgerstein's 

 excellent work, " Materialien zu einer Monographie betreffend die Erscheinungen der Trans- 

 piration der rflanzcn." I, 1887 ; II, 1889. -^ 



