m& Briars] 'tis a continued, fofr, loofe^ dry fubftant?.' la the 
Walnut, an obfervation may be made, by cutting a fmall and 
young branch, which hath the hrgeft pith, in March^ to the 
Pith in Tome branches, and through it in others of the like big- 
nefs : Whether any Sap iffues out or no by the ?/^willbe found 
by the quantity of the Sap ifluing from the oae and the other 
compared. 
The Obfervations afo of the Effe&s of Bering and Pegging 
the Pith, are referv'd to the like tryal about the fame time. But 
'tis probable, that if the whole Pith be forc'd our, the place fa 
bor'd will be fill'd with Sip, which will gelly there, and at length 
be converted into wood 5 as 'tis conceived it does yearly between 
the abovefaid films, coats, and in all the pores of the Bjdy of 
the Tree, andinthofe of the Bark proportionably. For, the 
Sap iffuing from the Bird] cut down, turns into a white Gtlly 
on the head of it ; and likewife in thofe holes that are boi'd ia 
the body of the Birch about March , by which the Tree receives 
its growth in all its pins. 
To the yth. Dr. Tonge, The points or ends of the Roots be- 
ing cat off, they will in proportion bleed as copioufly, as the 
Branches, and probably more 5 certainly longer, becaufe there 
is greater plenty of juice afcended above them, than the Bran- 
ches, and confequently more will iffue by thcm,than by any part 
of the Tree,higher then them. 
To the prh. The fame. Trees in their full growth, or near 
it, will probable yield more fap. 
To the 10th. The fame. From the latter end of January, to the 
middle of May^ Trees will bleed. Thofe,that are (aid to run frfl y 
are the PepUr, Asfe^ Abele, Mafk>Sicamere fome, as Willows y 
and the Birch^ tried by my lelf, are btft to tap about the m dole 
of the fecond feafon 5 and the Walnut towards the latter end of 
March, They generally bleed a full Month in the whole. 
Mr. Mtiford of Durham^ a very expert Gatherer and Preferver 
of Saps, affirms , that the Saps of the Poplar and Afp rife 
fo briskly in January , that they will bleed before the enu of that 
Month. The Sycamore will run in hard froft, when the Sap 
freezes, as it drops. 
Ee eee 
