The Fourth Part.

place to thicken into the Consistence and Appearance of white Butter, which with the least heat resum’d its Former Liquidness. In the Oyl of Olive drawn over in a Retort, I have likewise more then once seen a spontaneous Coagulation in the Receiver: And I have of it by me thus Congeal’d; which is of such a strangely Penetrating scent, as if ’twould Perforate the Noses that approach it. The like pungent Odour I also observ’d in the Distill’d Liquor of common sope, which forc’d over from Minium, lately afforded an oyle of a most admirable Penetrancy; And he must be a great stranger, both to the Writings and preparations of Chymists, that sees not in the Oyles they distill from Vegetables and Animals, a considerable and obvious Difference. Nay I shall venture to add, Eleutherius, (what perhaps you will think of kin to a Paradox) that divers times out of the same Animal or Vegetable, there may be extracted Oyles of Natures obviously differing. To which purpose I shall not insist on the swimming and sinking Oyles, which I have sometimes observ’d to float on, and subside under the spirit of Guajacum, and that of divers other Vegetables Distill’d with a strong and lasting Fire; Nor shall I insist on the observation elsewhere mention’d, of the divers and unminglable oyles afforded us by Humane Blood long fermented and Digested with spirit of Wine, because these kind of oyles may seem chiefly to differ in Consistence and Weight, being all of them high colour’d and adust. But the Experiment which I devis’d to make out this Difference of the oyles of the same Vegetable, ad Oculum, (as they speak) was this that followes. I took a pound of Annisseeds, and having grosly beaten them, caused them to be put into a very large glass Retort almost filled with fair Water; and placing this Retort in a sand Furnace, I caus’d a very Gentle heat to be administer’d during the first day, and a great part of the second, till the Water was for the most part drawn off, and had brought over with it at least most of the Volatile and Aromatick Oyle of the seeds. And then encreasing the Fire, and changing the Receiver, I obtain’d besides an Empyreumatical Spirit, a quantity of adust oyle; whereof a little floated upon the Spirit, and the rest was more heavy, and not easily separable from it. And whereas