fLATE 7. 

 AIR-PLATES KXPOSED IN BAKEHOUSES (30 minutes). 



(i.) Above-ground Bakeliouse (Z.) Agar culture, 22 liours at 37° G. 



(ii.) Under-ground Bakehouse (0.) Agar culture, 22 hours at 37° C. 



[To face page 86. 



