The SAP in TREES. 15 



OBS. 12. On the day an incifion began to bleed, the one imme- 

 diately above it .appeared always moifter than formerly. This 

 moifture appeared firft, and in greateft quantity, between the 

 wood and bark, and always {hewed itfelf firft on the loweft 

 fide of the incifion. 



OBS. 13. At whatever height an incifion bled, all the incifions 

 below it conftantly did fo at the fame time. 



MARCH 23. 

 Thermometer, at noon, 46. ; at midnight, 42. 



Thermometer, at noon, in the fun, 68. 



THE eighth incifion, which was feven feet high, bled for the 

 firft time ; the ninth was moift, but all above it dry. 

 OBS. 14. At 7- feet high flood the firft branch upon the tree, 

 marked A*, which was about three feet long. It was this day 

 cut at the extremity, and was found very moift, but not fo as 

 to form a drop. The next branch above it, marked B, was 

 placed eight feet high, and was eight feet long. This, being 

 alfo cut at the extremity, was found drier than the former. 



MARCH 24. 



Thermometer, at noon, 47. j at midnight, 35. 

 THIS day the ninth incifion began to bleed ; the tenth was 

 moift, but thofe above it dry as formerly. 



EXP. 5. The fap having now mounted to the juncture of feveral 

 branches, the branches B and C were cut at the extremity, 

 but without bleeding. The branch D was alfo cut at the ex- 

 tremity, and, in like manner, refufed to bleed. But when 

 this branch was bent down into the perpendicular direction 

 D E, and kept fo bent by the cord G H, the incifion at the 

 extremity did then begin to bleed, and in five minutes con- 

 tinued to drop. Yet the branch below it C, that remained 

 in its lateral pofition, had its incifion at the extremity ftilldry. 



COR. 8, 



* Vide Plate I. Fi&. i. 



