I. A paper of the Honourable Robert Boyl's, deposited with the secretaries of the Royal Society, Octob. 14. 1680. and opened since his death; being an account of his making the phosphorus, etc

There was taken aconsiderable quantity ofMan's Urine (because the Liquor yields but a small proportion of the desiredQuintessence ) and of this a good part at least, had been for a pretty while digested before it was used. Then this Liquor was distilled with a moderate Heat, this theSpirituous andSaline parts were drawn off; after which theSuperfluous Moisture also was abstracted (or evaporated away) till the remaining Substance was brought to the consistence of a somewhat thickSyrup , or a thinExtract . This done, it was well incorporated with thrice its Weight of fineWhite Sand ; and the Mixture being put into a strong Stone-Retort , to which a largeReceiver (in good part fill'd with Water) was so joyn'd, that the Nose of the Retort did almost touch the Water: Then the two Vessels being carefully luted together, a naked Fire was gradually administered for Five or Six Hours, that all that was eitherPhlegmatick orVolatile might come over first.