PART IV.
PART IV. PRUNING AND THINNING. For beauty we should have every variety of growth . . , . 185 Trees cannot attain thelr maximum height by nature—that is,
without pruning and thinning. , . , . . 186 The works of God can be improved by man. . . ; . 186 To grow valuable timber, maximum head on maximum height of
branchless stem . , . , , , ss , . 187
Rules for pruning for height . . . , . . . . 187
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Plantations are, and should be, Planted too thick to Brow) and should
be thinned every year . . . . 188 No turnips without hoeing ; no trees without thinning oo . 189 Never too late tothin . . . 189 Cut the worst plants worst placed ; leave the best plants best placed 189
Pruning does not increase the aggregate quantity of wood made by a tree, but, by improving its location, increases the measurable
timber. . . , . ; , ee . , . 191 Example. . . . 192 That a branchless stem is a natural ‘attribute of a tree is a mistake
of De Candolle’s . , . 194 A living branch forms a eross-grain ; when it dies, an united knot ;
what is afterwards inclosed, a disunited, movable knot , . 196 Healing over an amputated branch . . . . . . 202 Prej udice against pruning with the saw, a vulgar error . . . 204 Explanation of Plates I. and II... . . , , , » 205 Best time for pruning. , , . , , . 214 Measurement and longevity of trees . . . , . . 215