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



345 



It is interesting to compare the results in the last two experi- 

 ments with the effect of double cuts on gymnosperms. 



Exp. 15. Aug. 14, 1884. Scotch fir {Pinus sylvestris), (cut 

 under water). 



Rate 



(i) 



(") 



Here neither the effect of first nor second cuts is at all marked, 

 but in another experiment the effect was greater. 



Exp. 16. Pinus sylvestris, cut under water. 



In two other experiments the effect of doubling sawing was 

 to cause a depression represented by 100 to 50, and 100 to 33. 



With Yew (Taxus baccata) the effect is also somewhat variable. 



Diameter of branch 16 mm., incisions 13 and 15 cm. from cut end. 



