358 
Cultivation and Management of Hops, 
mould-germ, and so causing its destruction ; or by chemically 
uniting with and absorbing its oxygen.* M. Vialles holds this 
former opinion, and believes that the theory of volatilisation is a 
deplorable error. It must be confessed, however, that it does 
seem more feasible that the sulphur, combining with moisture 
and oxygen, gives off fumes and vapours of sulphurous acid, 
which are prejudicial to the development of fungi, at the same 
time being so gradually evolved as not to injure the other vege- 
tation. And this is probably why it acts more quickly in damp 
weather. 
The sulphur is thrown up evenly over the plants by the revolv- 
ing fan of the sulphurator, as here illustrated. The quantity 
Fig. 7.— The Sulj)hurator. 
thrown up is regulated by a screw, so that from 40 lbs. to 2 cwt, 
can be put on per acre. From 50 to 80 lbs. suffice for each 
application. The weather should be calm, and night is the 
better time for the operation, as the moisture fixes the sulphur 
on the plant. Gi-eat quantities were showered down when sul- 
phuring was first introduced, from large dredges, like those which 
* Professor Brazier, Professor of Chemistry at Aberdeen University, holds this 
opinion from having [noticed the effect of road-dust upon mould in the parts of 
gardens adjoining roads. 
