The SAP in TREES. 19 



COR. 13. We find, that when the parts of a tree are not fully re- 

 plete with fap, they- will bleed with a certain degree of heat, 

 but will refufe to bleed with a fmaller de'gree : That the more 

 a tree is replenished with fap, the lefs degree of heat is necef- 

 fary to make it bleed, and vice verfa. On the I3th of March, 

 the third incifion refufed to bleed with the heat of 44. ; but 

 on this day, the feventh incilion bled with the heat of 39. 



MARCH 27. 



Thermometer, at noon, 45. ; at midnight, 40. 

 THE eighth incifion bled ; but the ninth, which had bled for- 

 merly, was dry. The inverted branch continued to bleed at its 

 extremity E. 



MARCH 28. 



Thermometer, at noon, 49. ; at midnight, 43. 

 THE eighth incifion bled ; but the ninth was dry, as on the 

 preceding day. The inverted branch continued to bleed plen- 

 tifully at its extremity. 



OBS. 22. The buds on the inverted branch were now fwelled 

 to a larger fize, and were evidently more forward than any 

 others upon the tree, though this was only the fifth day fince 

 the branch was placed in that poflure. 



EXP. 8. On the 23d inftant, I had cut feven incifions, a foot 

 diftant from each other, upon the branch B. Thefe incifions 

 were cut deep, near to the pith of the branch, perpendicular 

 to the horizon, and were made with a view to folve the two 

 following queries : 



1. WHETHER the fap makes a fwifter progrefs in young than 

 in old wood ? And, 



2. WHETHER, at this time, there was any defcending fap to be 

 difcovered in the tree ? 



THE experiment upon this branch afforded full fatisfa&ion con- 

 cerning both thefe queflions. 



C 2 As 



