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Updated: May 22, 2025
To produce them, an incalculable interplay of causes must be at work, each with its proper period and law of action. All the elements of the phenomenon are then in a perpetual state of flux, and absorb for their continual redetermination, the arduous and combined labours of many astronomers. Nor is this trouble superfluous.
It was revived, however, about 1840, by Dumas, whose great authority secured it a respectful hearing, and whose careful redetermination of the weight of carbon, making it exactly twelve times that of hydrogen, aided the cause. Subsequently Stas, the pupil of Dumas, undertook a long series of determinations of atomic weights, with the expectation of confirming the Proutian hypothesis.
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