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they will continue unmixed for some time ;but, without any agitation, they will incor-porate gradually, a white cloudiness beingalways seen where they are contiguous.When they are shaken together a small de-gree of heat will be produced, and numberlessbubbles will be formed, which, however, arepresently absorbed. There is also at first; awhitish vapour over the surface of the mix-ture ; and after some time, though both theacids, be ever so pure, and the vitriolic hasbeen distilled again and again, there will bea deposit of a white substance, which I havenot yet examined.

I have observed that the yellow colour ofthe common spirit of nitre is discharged bya mixture of the vitriolic acid. When Ipoured a weak green spirit of nitre uponconcentrated oil of vitriol, it became yellowwhere they were contiguous; but the quan-tity of nitrous acid being much greater thanthat of the vitriolic, it was green above,without any visible vapour on its surface.The next morning the nitrous acid was

colourless,