REMARKS.
We have already published ([p. 54].) Mr. Pierce's discovery of the pulverulent carbonate of magnesia, and have pointed out its connexion with Dr. Bruce's previous discovery of the hydrate of magnesia, or pure magnesia combined with water only. Mr. Pierce has now added another important link to this chain, and future mineralogists may quote the vicinity of New-York as affording,
1. Pure magnesia, crystallized and combined with water only.
2. Carbonate of magnesia, pulverulent and white.
3. Carbonate of magnesia, in very delicate and perfectly white acicular crystals.
We possess specimens of them all.
Art. X. On a curious substance which accompanies the native Nitre of Kentucky and of Africa.
Art. X. On a curious substance which accompanies the native Nitre of Kentucky and of Africa. Communicated in a letter to the Editor, from Samuel Brown, M. D. late of Kentucky, now of the Alabama Territory.