“…Of the two, dust is probably responsible for greater degrees of air contamination (Hare and MacKenzie, 1946;Duguid and Wallace, 1948). Such infected dust arises for the most part from the movement of fabrics-for example, blankets, clothes (van den Ende, Lush, and Edward, 1940;Green, Challinor, andDuguid, 1945 Duguid andWallace, 1948), bandages (Bourdillon and Colebrook, 1946), and handkerchiefs (Dumbell, Lovelock, and Lowbury, 1948), and to a somewhat less extent from floor-sweeping (Green, Challinor, and Duguid, 1945), although much of this floor dust has come in the first place from fabrics.…”