

PLATE VII.— PENICILLIUM GLAUCUM SporES DESTROYED BY SULPHUR 
FUMIGATION. PETRI DISHES OF STERILE AGAR WERE EXPOSED ON THE 
FLoor OF A RooM ONE-HALF Hour AFTER SporES oF FUNGUS 
WERE DIFFUSED THROUGH THE AIR: 1, BEFORE FUMIGATION OF 
APPLES; 2, AFTER FUMIGATION OF APPLES. 
