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on every side of the Tree, some deeper, and some shallower, with a good large Auger; and one quite through sloaping. From which Experiment, after various tryals, may be found the difference of the Sap rising on the North and South, and so likewise of that which comes from the Bark onely peel'd off, and that which ascends in the inner part of the Tree. The weight also may be compared of that which issues from the Bark, with that, which issues from the Body, The internal Heart-sap may also be drawn apart, by boring a smaller Auger-hole in the middle of a greater, and fitting it with a long pipe, adjusted, to that inner orifice. If no difference be found in these, the presumption will be greater, that the difference of Heart (as when they call heart of Oake) and Sap in Timber is not from the plenty or scarcity of sap, but from the season of felling. This Interception of the Heart-sap may have an effect analogous to the boring out the Heart.
To the 5th. Dr. B. faith; I answer Experimentally, That if a Circle be drawn round about any common English Tree, as Oak, Elme, Poplar, &c, by Incision to the Timber (how thin soever the Knife be) so that no part of the Rind or Bark to the very solid Timber be un-cut, the Tree will die from that part upwards. Onely the Ashe, (of all that I could try) will grow on, and prosper notwithstanding the incision. My Brother (T. B.) shew'd me some old and huge Ashes, which were bared of the Bark by the Deer, from the root 4 feet upwards quite round; yet they had continued their growth many years, and some parts of the Bark, which were left in few places not so broad as the palm of my hand, had a fresh verdure more lively then the parts of the Bark which remain'd above the baring. Yet if some Incisions by hackings be made, or if the Branches of some Fruit-trees (especially the Gennet-moyle) be quite bared under a knot near the body of the Tree, and that knot and bare part be well cover'd with loame or good mould in June, that branch will not onely survive, but will be apt to take root and become a young Tree of speedy growth, if cut off below the baring, and set at a fit depth at the end of Autumn, or about Candlemas rather. Where such transverse hackings are made, or Contusions in the Bark, many Vegetables are apt to gather
