394 Objfervations on the GrowtB: of Trees 
formed a moift atmofphere round it. In afew hours the leaves. 
became erect, and elaftic, and within three days the whole plant 
aflumed the afpeét of perfect healtir. “The roots liad wfull fup- 
ply of moifture, but it did not send: ; the ris were gm 
od the plant inftantly flourifhed. oir od ton been 
"The firft appearance of vegetation among teri esa is thie- 
deuda of the fapin the fugar maple. ^"Thiscbepills with tHe- 
frofty mornings in the month of February. ‘Fhefe hoar frofts . 
never apppear. But when the air is moift'; and it is invariably 
“Gertaity that the fap: ceafes to flow when’ the wind is at’ north- 
weft and the air dry, be the ftate of the earth as to moifture or 
ffoft as it may. From fence ‘it appears, that the fapi is extract 
‘ed from the air even before the Leaf is expanded, and not front 
= the earth, as is generally füppoféd. ^ ' 
"Phe next appearance of vegetation, is tlie fwelling of the: 
bud in the fearlet maple ; and in this, as in all other trees, it is 
to Ey puspofe to obferve, that tlie uppermoft buds always felt: 
;'and its beautiful bloffoms are (een earlieft to unfold on the 
topmoft boughs. This cannot dépend on a fap’ derived from: 
the root ; m dn that eate, the iver Moord iate 'anfold- 
êd firft. 
"The hufbandmen of Noto orf, Cys nem tHo Tandis which: 
do iot prod&ce oak- -timber füfficient for fencing, fhave the bark 
‘from the pine ttees‘in thelatter part of Winter, and in the {pring} 
the turpentine running down: over that part of thé tree which? 
has been barked, fills tlie pores, and preferving i it again the 
‘Water, Mec the‘ pine: a very durable poft for fencing. 2 : THe 
ntine, as I conceive, being collected from the air, defcends 
font the | top of the tree. This practice, lately’ introduced, 
deferves attention, not only ag an argument in this queftion; but 
T 
