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Animal substances are of the first kind: _acids_, neutral salts, rancid oils, and metallic _oxids_, are of the second.
Upon examination of the cavities from which oxidized plugs have been removed, these oxids will be found to have had
Alkaline earths all been distinctly analysed and shown to be metallic oxids -- first amalgamated with quicksilver in the Galvanic circuit -- quicksilver distilled off -- indications respecting the composition of the other earths similar but not equally decisive (Murray 1, 336) -- why uninflammable.
Page 19 by means of the electric spark -- by heating with metallic oxids -- rationale of the last decomposition -- reasons from analogy to suppose ammonia to be a metallic oxide -- nature of the proof that it is so.