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breuses, la seule chose dont nous puissions encore être sûrs, c’est que la cause de la rosée se trouvera parmi les circonstances qui distinguent le verre des métaux polis[1]... Cherchons donc à démêler cette circonstance, et pour cela employons la seule méthode possible, celle des variations concomitantes. Dans le cas des métaux polis et du verre poli, le contraste montre évidemment que la substance a une grande influence sur le phénomène. C’est pourquoi faisons varier autant que possible la substance
- ↑ “Now, first, no dew is produced on the surface of polished metals, but it is very copiously on glass, both exposed with their faces upwards, and in some cases the under side of a horizontal plate of glass is also dewed. ” Here is an instance in which the effect is produced, and another instance in which it is not produced ; but we cannot yet pronounce, as the canon of the Method of Difference requires, that the latter instance agrees with the former in all its circumstances except in one ; for the differences between glass and polished metals are manifold, and the only thing we can as yet be sure of, is, that the cause of dew will be found among the circumstances by which the former substance is distinguished from the latter.
