18S5. 



On the transpiration-stream in cut branches. 



343 



Exp. 10. A branch of Sycamore (Acer Pseudo-platanus) (cut 

 under water) was mounted in the potometer and gave the 

 following readings : 



In another observation upon this plant the depression caused 

 by the double sawing was not so great; the rate after the operation 

 being ^ of the original rate. 



Exp. 11. Elder (Sambucus nigra) cut under water, Aug. 17, 1885. 



(ii) 



p.m. 



5-36 



39 

 40 



41 

 45 

 46 



48 



Rate 



100 

 100 

 Sawed through ~ of diameter at 13 cm. 



from the base 

 94 

 96 

 Sawed through y ¥ diameter opposite 



to (i) and 2 cm. above it 

 5-4 



Exp. 12. Horse-chestnut (jEsculus hippocastannm*) cut under 

 water, Aug. 13, 1884. 



* Other experiments with Horse-chestnut do not give the same amount of falling 

 off in rate of absorption. Thus in one instance the fall was from 71, before the first 

 saw-cut, to 27 after the second saw-cut. 



