33 On the MOTION of 



trunk continued to bleed during the feafon, but it gave over 

 bleeding at the fame time with the other trees. The wood 

 became dry, the fap flowed between wood and bark, which 

 were then eafily feparable from one another, and the bark it- 

 felf became moift, though it had neither buds nor leaves 

 upon it. 



EXP. 14. All the buds were ftripped off one fide of another 

 birch tree and all the buds on the other fide, were left en- 

 tire. Both fides of the tree, however, ceafed to bleed at the 

 fame time. The wood turned dry, the fap flowed between the 

 wood and bark, and the bark became moift on that fide of the 

 tree which was deprived of its buds, in the fame manner, 

 .and at the fame time, in which thefe alterations took place 

 on the fide of the tree which retained its buds, and whofe 

 leaves were now confiderably expanded. 



COR. 2i. The drying up of the fap, therefore, in the wood of 

 trees, about the time of their vernation, proceeds not from 

 the evaporation occafioned by their leaves, but from a general 

 communication and diffufion of the fap from the wood -into 

 the bark, at that feafon. To this caufe, likewife, and not to 

 any influence of the leaves, is to be afcribed the running of 

 the fap between the wood and bark, during the feafon of 

 Sjer nation. 



MAY 10. 



Thermometer, at noon 63. ; at midnight, 50. 



THE leaves of the tree were now expanded, and the wood was 



every where quite dry. The fap flowed between the wood and 



the bark, fo as to wet the finger, and bled fenfibly. The bark did 



not, .in any degree, bleed ; but was every where more moift and 



( fucculent than -when the fap flowed in the wood. The bark 



peeled eafily from the wood, the alburnum from both, and its 



fibres were more eafily feparated from one' another than at any 



period while die fap ran in the wood. 



C O N- 



