PLATE I. 
Photographs of plates made from a pure cultivation of B. coli commune, after 48 hours' incubation 
at 42° C, approximately the same number of organisms being introduced in each case. 
Fig. 1 — Ordinary nutrient agar. 
Fig. 2 „ ,, ,, carbolized in proportion of 1 in 1000. 
Fig. 3 „ „ „ „ „ ,, 1.3 in 1000. 
Fig- 4 » >> » „ „ „ 1-5 in 1000. 
