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He also made quite extensive investigations as to the geological formations and fossils found in his neighborhood. Even during his student days with Hunter he had been much interested in the belief, current in the rural districts of Gloucestershire, of the antagonism between cow-pox and small-pox, a person having suffered from cow-pox being immuned to small-pox.
From the fact that certain persons, usually milkmaids, who had suffered from cow-pox seemed to be immuned to small-pox, it would seem a very simple process of deduction to discover that cow-pox inoculation was the solution of the problem of preventing the disease.
He was immuned from military service, he had a little capital of his own, and with Government aid he set to work. Within four months he had built an enormous plant on the banks of the Seine almost within the shadow of the Eiffel Tower. In six months he had enlarged his capacity so that he was producing 15,000 shells a day.
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