ADDITION OF A SOLUTION OF THE NITRATE OF BARYTES

a and h. A very densely white cloud formed in both and slowly subsided.

The acid reaction of b was not neutralized by standing twentyfour hours over a considérable quantity of pulv. cretæ, prep.

a and b. Both are highly volatile. A little from each bottle, placed in a watch glass, takes lire on the approach of flame, and burns with a very faint pale blue flame, with the production of much heat, perfectly unattended by smoke — the products of combustion being chiefly aqueous vapour and carbonic acid.

a leaves a small quantity of aqueous residue ; b none.

The following table will shew these features of each contrasted.