LETTER IV. · Letters on the Cholera Morbus. / Containing ample evidence that this disease, under whatever / name known, cannot be transmitted from the persons of those / labouring under it to other individuals, by contact—through / the medium of inanimate substances—or through the medium / of the atmosphere; and that all restrictions, by cordons / and quarantine regulations, are, as far as regards this / disease, not merely useless, but highly injurious to the / community.