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



341 



The following experiment gives similar results: 



Exp. 5. Portugal laurel cut August 11, 1885. 



Aug. 12. Time 



12-29 



43 

 1-4 



Rate 



82-0 

 83-3 



82-0 



(i) Sawed through T 7 g of diameter (13 mm.) at 13 cm. from 

 the cut end : 



1-13 



15 



76-9 

 7G-9 



(ii) Sawed 4 mm. deep opposite to, and 2 cm. above (i) : 



1-18 



20 



G8-5 

 72-5 



(iii) Deepened (ii) to 6 mm., i.e. T 6 ^ of diameter : 

 1-22 I 17-9 

 26 | 19-0 



(iv) Deepened both (i) and (iii) to 8 mm., ^ diameter : 

 1-33 | 11-0 



The following examples show that when the two incisions un- 

 doubtedly overlap, the fall in rate after the second incision is great: 



Portugal laurel cut from the tree on July 28, 1885. 



Exp. 6. July 31. 



a.m. Rate 



11-57 166-7 



59 156-3 



12-9 158-7 



(i) Sawed through T %- of diameter* : 



a.m. Rate 



12-13 90-9 

 15 95-2 



(ii) Sawed through yV of diameter opposite (i) : 



12-23 

 37 



6-9 

 8-1 



Exp. 7. Portugal laurel cut from the tree August 11, 1885. 



August 12. 



p.m. 



12-48 



Rate 

 90-9 



Incisions at 8 and 10 cm. from the cut surface. 



