OF COLOCASIA IN JAMAICA. 47 
set had been broken off; in another through a wound made by 
some instrument. 
We fully believe that the fungus could not penetrate the thick 
periderm, as is proved by the hyph not being able to penetrate 
it from the inside; and further, if tubers with an unbroken skin 
could be used for propagation, the disease would speedily be 
eradicated. 
As this method is not practicable, the tubers, after being cut 
or broken, should remain in a dry place for some time before 
planting, to allow periderm to develop over the injured portions ; 
or the wounds might be coated with some substance to prevent 
the entrance of the parasite. 
Fig. 1. 
Vertical section through a diseased “head” of Colocasia, $ nat. size. The black 
portion is diseased, the parasite having effected an entrance through the 
broken surface at A. The hyphe are penetrating the offset B along the 
vascular bundles, represented by the dark lines. 
