PLATE IV. 
Fig. 8 
Fig. 5 — Sewage contaminated mud. Carbol agar I in iooo. 
Fig. 6 — Sewage contaminated mud. Bile-salt agar. 
Fig. 7 — Stalactite growth of B. pestis, natural size. 
Fig. 8 — Stalactite growth of B. pestis. 
