(2145) 
And from the fore-noted difference of Stocks, and the 
differing grains of the Roots and Timber, as alfo from 
the differing Leaves (if accurately infpetJled, and con- 
fidered,) we may in time perhaps difcover feme parti- 
cular caufes of the differing Sap, Fruit and BloiToms. 
And k would become the accuratenefs of this Age, in 
which fo many are expert in Draughts, and in Chalco- 
graphy, to annex to the figure of Plants , the texture 
and particular grains of each root, ftem, and branch, 
both for ornament, and to fuggeft further inftrudtions^ 
whileft i?^e learn their tafts and other quahties. 
'Tis about fifteen Years fince I publiflied a hint , how 
to difcover by the Colour, Figure, Tendcrnefs, and 
afperitics of the Leaves of young Apple-Plants, and 
Crabs, firfl appearing in the Spring, which Plant would 
yield the more delicate , and which the more auftere 
fruit, and liquor, to feveral kinds and degrees of deli^ 
cacyand aufterity, fatnefs and infipidnefs, and vigour 
or brisknefs* And this I think allows a confideration 
for fome efficacy, orfign (atleaftj of change or ope« 
ration in the Defcent of Sap, But as far as I dare, or did 
deny the defcent of Sap, I meant it in the vulgar fenfe 
of that expfeffion, t^^';^* the main quantity of Sap, which 
afcends in the Spring, and is gradually hardened into 
leaves, bloffoms, fruit, timber, in fuch manner as the 
Offification in young Animals is dcfcribed by Dr, 
i(fr^;^r/«jg/W in your laft Trad of NuQi. 70. 'Tis a large 
quantity of Sap, which is expended on the fruit and 
growth of fome Trees, on Acorns, Wallnuts, Chef- 
nuts ; and this returns not to the root in winter, yet 
confiftswell with the Sentiment of tht Circulation o{ the 
Sap, which in fome feafons may run the round more 
fwiftly than in other.* neirher do I difcern, that this 
makes any oppoficion to Worthy Mr, Re(df intentions. 
1 have long ago publiflied, and do here again confirm 
