sycomor before any other: But to preserve it in best condition for brewing, till you are stored with a sufficient quantity, it is advis’d, that what first runs, be insolated and placed in the sun, till the remainder be prepar’d, to prevent its growing sour: But it may also be fermented alone, by such as have the secret: To the curious these essays are recommended: That it be immediately stopp’d up in the bottles in which it is gathered, the corks well wax’d, and expos’d to the sun, till (as was said) sufficient quantity be run; then let so much rye-bread (toasted very dry, but not burnt) be put into it, as will serve to set it a working; and when it begins to ferment, take it out, and bottle it immediately. If you add a few cloves, &c. to steep in it, ’twill certainly keep the year about: ’Tis a wonder how speedily it extracts the tast and tincture of the spice. Mr. Boyle proposes a sulphurous fume to the bottles: Spirit of wine may haply not only preserve, but advance the virtues of saps; and infusions of rasins are obvious, and without decoction best, which does but spend the more delicate parts. Note, that the sap of the birch, will make excellent mead. 5. To these observations, that of the weight and virtue of the several juices, would be both useful and curious: As whether that which proceeds from the bark, or between that and the wood be of the same nature with that which is suposed to spring from the pores of the woody circles? and whether it rise in like quantity, upon comparing the incisures? All which may be try’d, first attempting through the bark, and saving that apart, and then perforating into the wood, to the thickness of the bark, or more; with a like separation of what distills. The period also of its current would be calculated; as how much proceeds from the bark in one hour, how much from the wood or body of the tree, and thus every hour, with still a deeper incision, with a good large augre, till the tree be quite perforated: Then by making a second hole within the first, fitted with a lesser pipe, the interior heart-sap may be drawn apart, and examin’d by weight, quantity, colour, distillation, &c. and if no difference perceptible be detected the presumption will be greater, that the difference of heart and sap in timber, is not from the saps plenty or penury, but the season; and then possibly, the very season of squaring, as well as felling of timber, may be considerable to the preservation of it.