[ 33 ] vered the inner furface of the recipient. The mafs which was left in the retort after the ope ration was over, was almoft as hard as (tone. 6. The fame phenomena appeared, when a quan tity of wate’r was put in the recipient. The vapours in their firft riling, formed a white ipot on the furface of the water, which by de grees encreafed to fuch a thicknefs, as entirely to obftrudt the further accefs of the vapours to the water. The veffel being Ihook, this cruft was broken into feveral pieces, and funk to the bottom. Immediately after, a new cruft was formed by the contaft of frelh vapours with the furface of the water. At the end of the operation, the inner furfaces of the retort and the recipient appeared white, and were con- fiderably corroded. The water in the recipient* Upon examination, contained a confiderable quantity of a new acid* difengaged from the fpar by the oil of vitriol. 7. The mafs remaining in the retort (5) being pounded and edulcorated with water, the lixivium was infpifiated till a pellicle appeared on its furface •, by the addition of two fcrupiles of alum, a quantity of lelenties was depofited ; the fuperabundant acid was again faturated with fait of tartar, but there enlued no further cryftallization. tf. The laft infpifiated lixivium turned blue, by the addition of a lixivium of ox-bloody and this only when the green fpar had been employed for the experiment, which proved that fome particles of iron had caufed the green colour in the Sparry Fluor. 9. The refiduum which remained after the edul- coration (7) was boiled in feven gallons of rain water, by Vv Inch operation a confiderable quan- D tity