it which may be us'd, unless People would allow it two or three years time to lie Fallow, in order to amend it by rest, but there is no pleasure in losing so much time: When we resolve to make this Exchange of Mould, and yet are unwilling to remove the Tree which is not Old, one half of the Roots must be Prun'd short again, which will suffice for the first Year, doing the same again at the end of two years, to the other half of the Tree: Nothing Exhausts the Ground more than the Roots of Trees lying long in the same place, especially the Roots of Neighbouring Trees, particularly Palli∣sado's of Elms; Fruit-Trees must of necessity Pine, or Perish, if that Neighbourhood subsists.
When the Ground is too dry, and light, the best Remedy is to soak it often with frequent Waterings, or by Artificial falls of Water, or else by ordering Spouts, or, Dreins in such a manner, that they may Conduct the Water of Rains into the Squares and Bordures, as I have explain'd it in the Treatise about Soils.
When the Ground is too moist, that part must be rais'd where the Trees stand, making lower Ridges to receive the Waters, and Conduct them out of the Gardens by Gutters, or Aqueducts, as I have done in the Kitchen-Garden of Versailles.
When there is not Mold enough, it must be augmented, either about the Roots, re∣moving all the ill Mould, to put better in the room of it; or else laying new Mould over the Surface of it; the Mould being thus amended, without doubt the Trees will thrive better in it, and grow more Vigorous.
When the distemper is only visible by a certain yellowness, as for Example; Pear-Trees Graffed upon Quince-Stocks, in certain Grounds, always grow yellow, tho' the Ground seems to be pretty good; it is a good and certain Advertisement to remove them, and to place others in their room upon Free-Stocks, which are much more Vigorous, and agree better in an indifferent Soil, than others.
When Peaches Graffed upon Almond-Stocks, cast too much Gum in moist Grounds, others must be Planted upon Plum-Stocks, and when they do not thrive upon Plum-Stocks in Sandy Grounds, only such must be Planted there, as are Graffed upon Al∣monds.
If, on the other hand, the Tree appears over-burthen'd with Branches, so as only to shoot very small ones, it must be eas'd, until it begins again to produce fine Shoots, always performing that Pruning, by lowering the uppermost Branches, or by removing part of those that cause a Confusion in the middle, observing the Maxims I have establish'd for good Pruning.
When the Distemper proceeds from the Trees being ill-Condition'd before its being Planted; as for instance, from its having a Scabby poor Foot, half dead for want, or from its being too weak, the best way is to pull it out, and place a better in the room of it.
If the Tree, being good in it self, has been Planted too deep, or too shallow, or with too many Roots, the best expedient is to take it up again, Prune the Roots a-new, and Re-plant it according to the Rules of Art.
And to all these Ends, it is very necessary to keep always some Dozens of good Trees in Baskets, to place new ones ready grown in the room of such as must be remov'd.
When the Trees are attack'd with some Cankers, you must with the point of a Knife remove the part so tainted to the quick, and then apply a little Cow-Dung to it, covering it with a piece of Linen, a kind of Rind will grow over it, which will cover the Wound, and so that Accident will be Cur'd.
When Catterpillars annoy a Tree, Care must be taken to remove them.
When Rats gnaw the Barks, Snares and Traps must be laid for them.
When the Distemper is suppos'd to proceed from Tons, the Foot of the Tree must be un∣cover'd to Extirpate them absolutely, putting new Mould in the room of the old, after ha∣ving shortned the Roots that are gnaw'd.
Among the Incurable Distempers of our Trees, I reckon first Old Age; when for In∣stance, a Pear-Tree, or Plum-Tree has serv'd for Thirty, Forty, or Fifty years, we may conclude that it has attain'd a decrepit Age, and consequently, that it has perform'd its part, and is out of date, there is no hopes of a return, it must be taken out, not leaving any of its Roots into the Ground, putting new Mould into the room of it, in order to Plant new Trees there, when People are desirous of seeing Trees in the same Place.
In the second place, I reckon the Tigers which stick to the back of the Leaves of Wall-Pear-Trees, and dry them up by sucking all the green Matter that was in them, among the Incurable Distempers; I have imploy'd all manner of strong, sower, corrosive, stink∣ing Lees, Viz. of Rue, Tabacco, Salt, Vinegar, &c. to wash the Leaves, and Branches: I have, by the Advice of some of the Curious, imploy'd Oyl; I have smoak'd them with