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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: from the surface against which it was liberated. The bubbles of gas
liberated on one of the platinum plates or wires of a decomposing
cell are always much smaller, and they rise in much more rapid
succession than those from the other. Knowing that oxygen is
sixteen times heavier than hydrogen, I have more than once concluded,
and, I fear, led others into the error of concluding, that the smaller
and more quickly rising bubbles must belong to the lighter gas.
The thing appeared so obvious that I did not give myself the trouble
of looking at the battery, which would at once have told me the nature
of the gas. But Faraday would never have been satisfied with a
deduction if he could have reduced it to a fact. And he has taught
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