IV. If the medical theorist insists on being consulted, and we see fit
to indulge him, he cannot be allowed to assume that the alleged laws of
contagion, deduced from observation in other diseases, shall be cited to
disprove the alleged laws deduced from observation in this. Science
would never make progress under such conditions. Neither the long
incubation of hydrophobia, nor the protecting power of vaccination, would
ever have been admitted, if the results of observation in these
affections had been rejected as contradictory to the previously
ascertained laws of contagion.

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