C 387 ] 
It Is evident that the oak, afh, and other bur 
moil; common trees, are not naturally increafed in 
any other way, except fuch as are produdive of 
fuckers at a confiderable diftance from the flems ; 
and many of thefe do not generally perfed their 
feeds : to fay nothing of inferiour plants, that fome- 
times, in the phrafe of gardening, lay themfehes. 
But thofe fuckers, till parted from the parent trees, 
and removed from the place, are not often better than 
underwood, which may be one reafon, why thefe 
kinds do notincreafe fo extenfively as the former. 
And if our forefathers had not induftrioufly raifed 
and increafed (if not previoufly introduced) the moft 
common and moft ufeful trees, perhaps we ihould 
not obferve them to increafe naturally more, or have 
found them more numerous, than many that we 
know to be exotic, and yet are as eafily increafed, 
and do of themfelves increafe as faff, proportionally, 
and are as hardy, as any trees we have. 
Yet it is not to be expeded, that thefe of exotic 
origin, more than thofe that have been long familiar 
to us, flaould increafe alike in all foils, or in all 
counties, fince there are fome foils that are far from 
being general. 
Mr. Da Cofta, in his Nat. Hift. of Foffils, obferves, 
that “ Chalk is found chiefly in the South-eaft part 
“ of this ifland,” fo that, “ if a ^raight line were 
drawn from Dorchefter (in Dorfetlhire) to thecoaft 
•“ of Norfolk, it would almofl; include our chalky 
ftrataj” and I believe his obfervation to be juft, 
except that, though the line be drawn even to the 
moft Weftern part of that coaft, this foil extends 
conftderably beyond it, into Wiltfl;iire. 
D d d 2 We 
