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CHAP. XII. Of extracting of Oyls of vegetables by Distillation.
ALmost all herbs that carry their flowers and seeds in an umble, have seeds of a hot, subtil and aiery substance, and consequently oily. Now because the oily substance that is con∣tained in simple bodies,* 1.1 is of two kindes, therefore the manner also of extracting is two-fold. For some is gross, earthy, viscous, and wholly confused and mixt with the bodies out of which they ought to be drawn, as that which we have said is usually extracted by expression; this because it most tenaciously adheres to the grosser substance and part of the body, therefore it cannot by reason of this natural grossness, be lifted up, or ascend. Othersome are of a slender and aiery substance, which is easily severed from their body, wherefore being put to distillation it easily ri••es: such is the oily substance of aromatick things, as of Juniper, Aniseeds, Cloves, Nutmegs,* 1.2 Cinnamom, Pepper, Ginger, and the like odoriferous and spicy things. This the man∣ner of extracting oyls, out of them; let your matter be well beaten and infused in water to that proportion, that for every pound of the material, there may be ten pints of water; infuse it in a copper-bottom, having a head thereto either tinned or silvered over, and furnished with a couler filled w th cold-water. Set your vessel upon a fornace having a fire in it, or else in sand, or ashes. When as the water contained in the head shall wax hot, you must draw it forth, and put in cold, that so the spirits may the better be condensed, and may not flye away: you shall put a long-neckt-receiver to the nose of the Alembick, and you shall increase the fire, until the things contained in the Alembick boil.
* 1.3There is another manner of performing this distillation; the matter preserved and infused as we have formerly declared, shall be put in a brass or copper-bottom covered with his head, to which shall be fitted or well luted, a worm of Tin; this worm shall run through a barrel filled with cold-water, that the liquor which flows forth with the oyl, may be cooled in the passage forth; at the lower end of this worm you shall set your Receiver. The fire gentle at the first, shall be increased by little and little, until the contained matter, as we formerly said, do boil; but take heed that you make not too quick or vehement a fire, for so the matter swelling up by boiling may exceed the bounds of the containing vessel, and so violently flye over.
Observ ng these things, you shall presently at the very first see an oily moisture flowing forth together with the waterish. When the oyl hath done flowing which you may know by the color of the distilled liquor, as also by the consistence and taste, then put out the fire; and you may se∣parate the oyl from the water by a little vessel made like a Thimble and tied to the end of a stick; (or, which is better, with a glass-funnel, or instrument made of glass for the same purpose.) Here you must also note that there be some oyls that swim upon the top of the water, as oyl of aniseeds; othersome on the contrary,* 1.4 which fall to the bottom; as oyl of Cinnamon, Mace, and Cloves.
Moreover you must note, that the watrish moisture, or water that is distilled with oyl of An∣niseed and Cinnamom, is whitish, and in success of time, will in some small proportion turn in∣to oyl. Also these waters must be kept several, for they are far more excellent then those that are distilled by Balneo Mariae, especially those that first come forth together with the oyl. Oyls are of the same faculties with the bodies from whence they are extracted, but much more effectu∣al; for the force which formerly was diffused in many pounds of this or that medicine, is after distillation contracted into a few drams. For example, the faculty that was dispersed over one pound of Cloves, will be contracted into two ounces of oyl at the most; and that which was in a pound of Cinnamon will be drawn into ʒiss. or ʒii. at the most of oyl. But to draw the greater quantity with the lesser charge, and without fear of breaking the vessels, whereto glasses are subject, I like that you distil them in copper-vessels; for you need not fear that the oyl which is distilled by them will contract an ill quality from the copper; for the watrish moisture that flows forth together therewith will hinder it, especially if the copper shall be tinned or silvered over. I have thought good to describe and set before your eyes, the whole manner of this operation.
- A. Shews the bottom, which ought to be of Copper and tinned on the in side.
- B. The head.
- C. The barrel filled with cold water to refrigerate and condensate the water and oyl that run through the pipe or worm that is put through it.
- D. A pipe of brass or lattin, or rather a worm of Tin running through the Barrel.
- E. The Alembick set in the fornace with the fire un∣der it.