119 
SUMMARY. 
The above account shows that healthy vanilla plants can be killed by 
a microscopic fungus which may be called Caluspora vanille in the 
following manner 
The earliest form of the mamom fungus, the Hainsea form, 
attacks the living leaves, and by m of bud spreading mycelium 
destroys their tissues, thereby ee es eath of the plant by 
destroying those organs on which the plant ers for an indispensable 
portion of its ns as also for the regulation of the amount of water 
contained there The death of the individual plant is caused entirely 
y the Im ie of the fungus, as the Cytispora and Calospora 
symptoms of disease, although not scientifically correct, is quite in har- 
mony with the above statements, for although the leaves are first 
attacked, and consequently first diseased, yet the mycelium of the 
fungus remains in the tissues for some weeks before it bursts through 
of disease at the tips on account of their being farthest from the source 
of food supply, and eds prepewy show external signs of disease even 
before the leaves themse 
PREVENTIVE MEASURES. 
It is apanle to suggest remedies for the probable various causes o 
h of all t 
Hainsea myceliun pernp arene kind of fruit on th leaves, 
the Cytispora form, which a poter: of ekg ing i 
form for probably several wee on dyi ; eventually, 
ospora 
on 'y on dead leaves—can alone reproduce the Hainsea form on living 
leaves, it follows ‘that if all fading and dead leaves td Mese od by 
burning, the fungus pest would soon disappear, or be at least so o reduced 
forms of the fungus that were forwarded with the material for investi- 
gation, it may be | tercie: that large quantities of leaves in = p 
condition are lying about in the iem plots. such i case 
they should at once be burnt, as I v once more on ieri the 
statement that the continuance of the dis disease dipak entirely on as 
presence of such diseased dead leaves, The fact that the appearanc 
