As concerning the Silk, I look on it as an excrementitious Matter also; designed by GOD Almighty (who makes nothing in vain) to become a _Capsula_ or Coffin to preserve the Insect in it safely, for such a Season as was intended it should remain there. All resinous Bodies are likewise non-electricable; which I think will tend rather to prove my Conjecture to be true than false: For, are there such Things as Pitch or Resin in _Nature_? Are they not made out of the Juice of Plants? Which Plants, whilst they remained in the Life of Nature, had nothing but their unalter’d Juice in them. Pitch and Resin became so by Art; and therefore no Time or Chance can give an Increase to their Quantity: From whence they may be supposed not to be in the Course of Nature. I am aware what Objection this is liable to; for, though it must be acknowleg’d that these Things are non-electricable, it may be asked, If they are not the most inflammable Things that can be imagined, and, consequently, susceptible of Fire; because Candles are made out of Wax, and Torches out of Pitch and Resin? To which I answer, That here it may be necessary to inquire, what occasions this Flame, which is produced either from the Candle or Torch? Can this Flame subsist one Moment, without the Passage of Air through it? I answer, No. Well then, as this Treatise is not intended merely to state Facts, but to account for the Nature of them, by the best Conjectures I can make, pray why does Air keep this Flame subsisting? If you will suppose, with me, that the Cause of all Heat, and the Appearance of all Fire in the World, is collected out of this universal Element of Fire; which, perhaps, will never increase nor diminish; it being dispersed where it is most invited; if therefore, I say, you will suppose with me, that this Air, which is full of a lambent Flame, when it has been invited by the Property supposed to be in it, that the biggest Body congregates the less; from these Considerations, I think it may be supposed, that the Flame of Fire is produced out of the Air, only; the Wax or Resin being a fatty sulphureous Matter, which, as Coals, may likewise be supposed to serve as a _Pabulum_, fitly adapted only to let this Element pass through it, for the Purposes here described. The more of the Air that passes through them, the quicker they burn; as when the Snuff of a Candle is taken off, which hindered the Quantity to pass thro’ it, it increases the Flame; though, before, the same Materials were employ’d. The same may be said of clearing the Ashes from, and stirring the Fire; which impeded the Quantity of Air from leaving its Fire behind, in its Passage through the Coals.