Fixed Air. ^9 j

2 oz. 4dwts. From half of this quantity Iexpelled about a pint and a half of air,one-fourth fixed, and the rest dephlogisti-cated. There remained little less than theoriginal quantity of ashes.

From the fame bone ashes, which hadbeen moistened with spirit of nitre, Iexpelled, on the 15th of April 1778,about ten ounce measures of air, about onethird of which was fixed air, and the re-mainder phlogisticated. These a sites hadbeen kept partly in an open dish, and partlyin a phial close stopped, owing to my re-moving from one place to another, and nothaving an opportunity of making the expe-riments that I intended. On the zd of Junefollowing, I extracted from the fame boneashes five ounce measures of pure fixed air,the small residuum being phlogisticated.They then weighed 1 oz. 8 dwt. 6 gr.

From an ounce of the bone ashes, fromwhich air had been expelled on the 24th ofFeb. 1777, but not those on which the pre-ceding experiment was made, I got by heat,in a gun barrel, on the 15th of April 1778,

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