1885.] On the transpiration-stream in cut branches. 



339 



Kohl has afterwards made a similar experiment with Pinus*. The 

 following series are of the same character : 



Exp. 1. July 23, 1884. Portugal laurel (Primus lusitanica). 



(i) 



(ii) 



This experiment shows two points. 



(i) A single cut produces no very great diminution in the 

 rate of absorption, whereas the second cut produces a great fall. 



(ii) After the first cut the diminished rate of absorption 

 begins at once to rise. The great diminution due to the second 

 saw is also temporary, and a slow recovery takes place. 



Exp. 2. August 1, 1884. Portugal laurel. 



(ii) 



Time 

 p.m. 



4-25 

 4-31 



Rate 



53 

 53 



(i) Sawed half through 



4-33 

 39 

 40 

 41 

 57 



5-20 

 6-9 



47 



48 



Sawed opposite to (i) and 2 cm. above it 



11 



13 



16 



22 



* Bot. Zeitung, 1885. 



t The sawings were in all eases made at a fair distance, i.e. 10 to 15 cm. from 

 the cut end of the branch. 



