154 ANTIDOTES TO MOULDS. 



As oxide of mercury prevented all growth, 

 SO oxide of lead, on the contrary, quickened it 

 The moulds were visible much sooner than 

 before. 



Oxides of iron, antimony, and zinc, were 

 completely neutral in their effects. Their 

 presence produced no difference whatever. 



Again, oxides of other metals, as copper, 

 nickel, and cobalt, did not entirely prevent the 

 vegetation of the moulds ; but they were much 

 impeded by their presence, so that they grew 

 and spread a great deal more slowly. 



The proximity of any perfume always proves 

 a complete antidote to the growth of every 

 mould. 



No doubt, upon long and accurate trials, many 

 more curious facts would present themselves, 

 which at length might he reduced to a sort of 

 practical system, conferring great benefit on 

 the community at large. Suffering as we do in 

 our farms, our gardens, and in our houses, from 

 moulds, such discoveries would prove of inesti- 

 mahle value. As an instance, it may be stated 

 that flowers of sulphur dusted over the leaves 

 of peach trees in forcing houses, and potatoes 

 in frames, are found most effectual in preventing 

 the growth of erysiphe on the former, and 



