In a few days he had established three
facts;--first, that this rim of India-rubber would bear a temperature
of two hundred and seventy-eight degrees without charring; second,
that it would not melt or soften at any heat; third, that, placed
between blocks of ice and left out of doors all night, it would not
stiffen in the least degree. He had triumphed, and he knew it. He
tells us that he now "felt himself amply repaid for the past, and
quite indifferent as to the trials of the future." It was well he was
so, for his darkest days were before him, and he was still six years
from a practicable success. He had, indeed, proved that a compound of
sulphur and India-rubber, in proper proportions and in certain
conditions, being subjected for a certain time to a certain degree of
heat, undergoes a change which renders it perfectly available for all
the uses to which he had before attempted in vain to apply it. But it
remained to be ascertained what were those proper proportions, what
were those conditions, what was that degree of heat, what was that
certain time, and by what means the heat could be best applied.
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