48 



VEGETABLE SUBSTANCES. 



such as are sown by drilling or dibbling, are the most 

 likely to escape. 



Corn Mildew Undo frumenti greatly magnified. 



It has been often asserted, and was for a long time 

 believed, that the neighbourhood of barberry bushes 

 was hurtful by attracting the noxious fungus, but this 

 idea is now classed among unfounded prejudices. 



The grain of mildewed plants is found to be per- 

 fectly good for seed, and being smaller than sound 

 grain, a less measure is required for the purpose. 



Another formidable disease to which corn is liable 

 is known under the characteristic name of smut. 

 This injury consists in the conversion of the farina 

 of the grain into a sooty powder, which is more or 



