William Fergusson, Letters on the Cholera Morbus
“ No one, unless he can take it upon him to define the true nature of this new malignant Cholera Morbus, can be warranted utterly to deny the existence of contagion, but he may at the least be permitted to say, that if contagion do exist at all, it must be the weakest in its powers of diffusion, and the safest to approach of any that has ever yet been known amongst diseases. ”
