A choice collection of rare secrets and experiments in philosophy as also rare and unheard-of medicines, menstruums and alkahests : with the true secret of volatilizing the fixt salt of tartar / collected and experimented by the honourable and truly learned Sir Kenelm Digby, Kt., Chancellour to Her Majesty the Queen-Mother ; hitherto kept secret since his decease, but now published for the good and benefit of the publick by George Hartman.

An Operation with a Martial Regulus of {antimony}, wrought by Monsieur Toysonnier.

HE made a yellow Martial Regulus thus: Ignifie ℥iv. of Nails in a Crucible, then put upon it ℥viij. of good {antimony}, and give strong {fire} in a wind Furnace, to make all melt well, which to promote, cast in some Salt-petre, then cast it in an {antimony} Horn, and separate the Feces from the Reg. Ignifie ℥ij. of Nails more, and cast thereon the Feces (this Work must be done presently after the first) adding Salt-petre to make all melt well and clear: Then cast it in a Horn, and separate the scories from it, and wash it clean; it will be first white, but after a day or two will be yellow within as well as without.

Take of this Reg. and of ☽, ana ℥ss. melt them well together (he poured a little ☿ in them when they were near ready to con∣geal, and stirred with an Iron Rod, but the Mass took in little above ℥j. of ☿.) Beat it to Powder, add to it eight or ten parts of ☿, and grind exceedingly till they incorporate, (which required about twelve compleat

hours, often heating the Matter and Instru∣ments.) Then squeeze away so much ☿, that there remain only six parts; digest it three days in Sand by degrees, at last, very hot. Put the remaining Calx to Coppel with four charges of ♄, adding a little fresh ☽ to make it work better. Put the Mass, au depart, and you shall have twenty six gr. of good ☉.

Hartman.) The said Monsieur Toyson∣nier was Sir Kenelm's Operator; he was a French-man, and a very able Chymist, Sir K. brought him over with him from Paris, 1660.