"You had to be aware that I saw that photography was a mere episode in the history of the optical projection and when the chemicals ended, meaning the picture was fixed by chemicals, we were in a new era."

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It has long been known that the chemical atomic weight of hydrogen was greater than one-quarter of that of helium, but so long as fractional weights were general there was no particular need to explain this fact, nor could any definite conclusions be drawn from it.

— Francis William Aston