On the Probability That the Infection of Diphtheria Is Sometimes Transported by the Wind

sure and speedy solution. For us, the interest of such investigation does not limit itself to small-pox alone, but must extend to the generality of infectious diseases. Can the infection of cholera, enteric fever, erysipelas, scarlatina, diphtheria, be conveyed by the air ? If any such facility of transportation should be established in respect of small-pox,it will become necessary to scrutinise, by that light, and from that point of view, the behaviour of every other infection, to see if they do not all, or many of them, enjoy, in their degree, a like freedom and ease of dissemination. Early in 1880, some time before this question came to the