"From the weight of the detonized salt and the air contained in the room it is easy to calculate that in a unit weight of the latter not a \frac{1}{20000000}th part of sodium smoke could have been suspended. ...[I]t follows that the eye is capable of detecting less than \frac{1}{3000000}th of a milligram of sodium salt with the greatest distinctness. With such a sensibility of the reaction it is evident that only rarely is a sodium reaction not visible in glowing atmospheric air."
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Sodium
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