5. But to discourage none, oaks prosper exceedingly even in gravel and moist clays, which most other trees abhor; yea, even the coldest clay-grounds that will hardly graze: But these trees will frequently make stands, as they encounter variety of footing, and sometimes proceed again vigorously, as they either penetrate beyond, or out-grow their obstructions, and meet better earth; which is of that consequence, that I dare boldly affirm, more than an hundred years advance is clearly gain’d by soil and husbandry. I have yet read, that there grow oaks, (some of which have contain’d ten loads apiece) out of the very walls of _Silcester_ in Hantshire, which seem to strike root in the very stones; and even in our renowned Forest of Dean itself, some goodly oaks have been noted to grow upon ground, which has been as it were a rock of ancient cinders, buried there many ages since. It is indeed obser’d, that oaks which grow in rough stony grounds, and obstinate clays, are long before they come to any considerable stature, (for such places, and all sort of clay, is held but a step-mother to trees) but in time they afford the most excellent timber, having stood long, and got good footing. The same may we affirm of the lightest sands, which produces a smoother-grain’d timber, of all other the most useful for the joyner; but that which grows in gravel is subject to be frow (as they term it) and brittle. What improvement the stirring of the ground about the roots of oaks is to the trees, I have already hinted; and yet in copses where they stand warm, and so thicken’d with the underwood, as this culture cannot be practis’d, they prove in time to be goodly trees. I have of late tried the graffing of oaks, but as yet with slender success: Ruellius indeed affirms it will take the pear and other fruit; and if we may credit the poet,
The sturdy oak does golden apples bear.{ 39:1}
And under elms swine do the mast devour.{ 39:2}
Which I conceive to be the more probable, for that the sap of the oak is of an unkind tincture to most trees. But for this improvement, I would rather advise inoculation, as the ordinary elm upon the witch-hazel, for those large leaves we shall anon mention, and which are so familiar in France.