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abound in all climates; and are, perhaps, the most for- 

 midable of the enemies of the superior and cultivated 

 vegetable species. 



The mildew, which has often occasioned great 

 havock in our wheat crops, and which was particular- 

 ly destructive in 1804, is a species of fungus, so small 

 as to require glasses to render its form distinct, and 

 rapidly propagated by its seeds. 



This has been shewn by various botanists; and 

 the subject has received a full illustration from the en- 

 lightened and elaborate researches of the President of 

 the Royal Society. 



The fungus rapidly spreads from stalk to stalk, 

 fixes itself in the cells connected with the common 

 tubes, and carries away and consumes that nourish- 

 ment which should have been appropiated to the 

 grain. 



No remedy has as yet been discovered for this 

 disease; but as the fungus increases by the diffusion of 

 its seeds, great care should be taken that no mildewed 

 straw is carried in the manure used for corn; and in 

 the early crop, if mildew is observed upon any of the 

 stalks of corn, they should be carefully removed and 

 treated as weeds. 



The popular notion amongst farmers, that a bar- 

 berry-tree in the neighbourhood of a field of wheat of- 

 ten produces the mildew, deserves examination. This 

 tree is frequently covered with a fungus, which if it 

 should be shewn to be capable of degenerating into the 

 wheat fungus would offer an easy explanation of the 

 effect. 



