HOW TO GROW GOOD CORN. 187 



curiously formed organisms, such a mode of reasoning 

 is not conclusive. 



"Weeds have a great influence in producing mildew, 

 which perhaps may be accounted for from the fact 

 that weeds are in active growth as the wheat-stalks 

 decline in vigour ; and hence the constant evapora- 

 tion of uioisture from the weeds to the wheat is 

 continually re-moistening an ever-drying surface — a 

 most fertile source of mildew and moulds of several 

 descriptions. 



6. Fuccinia fabcu (Bean-rust).* — The brown pus- 

 tular rust-looking spots on the foliage of beans, and, 

 indeed, occasionally on the steins and pods of beans, 

 are sometimes common to this crop. They are 

 usually accompanied by a lessening both in quantity 

 and quality of this pulse, both in the garden and in 

 field culture, but certainly more generally in the 

 latter. Too gross manuring without well mixing the 

 dung with the soil would seem to be a constant source 

 of the evil. In fact, highly nitrogenized manures 

 appear to favour the development of all this class of 

 epiphytes, just as too much meat might bring about 

 different forms of rash or eruptions in the animal. 

 Weeds, which are too much permitted in beans, here 

 aid in perfecting the mischief; hence, then, we may 

 perhaps take it for granted that the mention of the 

 causes of mischief suggests the remedy. 



7. JEcidium berbcridls (Barberry-rust) is here re- 

 ferred to, from the opinion prevailing that it is the 

 cause of rust and mildew in wheat. We can no more 

 believe that the barberry-rust would produce rust in 



* This blight is mentioned here on account of its affinity to the 

 former. 



