The CONTENTS.

Sect. XVII. Of the Agitation of pureMercury in Water — — i

Sect. XVIII. Of the EffeCi of long con-tinued Agitation on Quicks her 184

Sect. XIX. Of the Conflitution of dephlo-gifticatcd Air, and a Review of the Obser-vations relating to it — — 152

Sect. XX. Of the Extraction of dephlo-gifticated Air from several Mineral Sub-fances —■ . — 203

Sect. XXI. Of the Production of dephlo-gifticated Air from the Vitriolic Acid andIron — — 213

Sect. XXII. Of the Production of dephlo-gijlicated Air by Means of the Vitriolic Acid,from other Metals — - — 226

Sect. XXIII. Of the Production of de-phlogijiicated Air from Earthy Sub-stances by Means of the Vitriolic Acid 236

Sect. XXIV. Attempts to procure Airfrom various Substances by means of Spirit ofSalt — — — 240

a Sect. XXV.