Out of oyls made by expression (as oyl olive, rape oyl, wallnut oyl, hempseed oyl, linseed oyl, and the like) there may be distilled a penetrating oyl, useful both out wardly and inwardly, which is done thus: Take common potters clay not mingled with sand, frame little bals of it, as big as a pigeons or hens-egg, burn them (but not too strong) to a hard stone, so that they may attract the oyl; and when they are no more quite red-hot, but pretty hot, then throw them into oyl olive which is the best; let them lye in it, till they be quite full and drunk of the oyl, which will be done in two or three hours (some cast them red hot into the oyl, but amiss, because the oyl contracts thence an _Empyreuma_) then take them out, and cast in one or two of them at once into your distilling-vessel made red-hot, and let it go; and within a while after cast in one or two more, and continue this till you have oyl enough. If the vessel be full of the bals, take them out with the tongs or ladle, that you may proceed without let in your distillation, and in this manner you need not fear the breaking of your retort or receiver, or the burning of your oyle. The distillation being performed take off your receiver, pour the oyl that came over into a glass retort, and rectify it from calcined Allome or Vitriol, and the Allome will keep back the blackness and stink, and so the oyl will come over clear, which must be yet rectified once or twice more with fresh calcined Allome, according to the intensness of penetrating which you look for; that which cometh over first, ought still to be caught by it self, and you will get a very fair, bright and clear oyl, which is very subtle; but that which cometh after is somewhat yellow, and not so penetrating neither as the first; and therefore it is but for external use to extract flores and herbs therewith, and to make pretious balsams for cold and moyst sores. Also you may dissolve with it Amber, Mastick, Myrrh, and the like attractive things, and with Wax and Colophony reduce it to a plaster, which will be very good in venemous sores and boyls, for to attract the poyson, and to heal them out of hand. If you dissolve in it common yellow sulphur made into powder, you will get a blood red balsom, healing all manner of scabs, and other like defects of the skin; especially when you add to it purified verdegrease, and in hot sores _Saccharum Saturni_, which in a gentle heat and by continual stirring about do easily melt and mingle therewith. It needeth not to be done in glasses, but may be done in an ordinary earthen pot or pipkin. _The use of the blessed oyl._