“…Type L3a is provisional because the pattern of activity, shown in Table 1, 1963-4, 1967, 19689 Melbourne 1968, 1969, 19703 Swan Hill 1967, 19681 Lismore 1968L5 91 Melbourne 1962-4, 1967-70 33 Sydney 1963, 1967, 1968, 1971 Swan occurred after 24 hr. incubation but, after 72 hr., the pattern changed to that of type L3 since the growths of the indicator diphtheria strains Ferris Nadjarian, Ferris Wagland and 116888 had completely traversed the original diametric streak.…”