512 VINE MILDEW. 



At the same time, a few vines were left in their 

 natural state. The three portions treated with the 

 different materials all showed the cure alike, while 

 the vines not powdered at all were entirely destroyed 

 by the disease." As some persons thought the 

 sulphur exerted an influence at a distance, he de- 

 termined to have another trial. He powdered the 

 vines with clay before flowering, and twice at a 

 later date. At one stage of his experiments there 

 were some signs of the disease ; but by repeating 

 the application it was entirely arrested. 



From these experiments he drew the following 

 conclusions : earth should be free from all sand and 

 gravel, dried a few hours, pulverized, and then sifted 

 or bolted like sulphur. Clay is easily prepared, 

 and adheres well to the vines. The application is 

 best after sunrise, while the vines are moist with 

 dew. 



We have repeated the experiments of the above- 

 named gentleman, but with success not equal to 

 his. This, perhaps, resulted from inaccurate prepa- 

 ration of the clay ; and it therefore deserves another 

 trial. 



(2) Erysiphe. "This word denotes white mealy 

 fungi. Examined under the microscope, they are 

 found to consist of necklace-like threads, springing 

 from a creeping mycelium. These clothe the surfiice, 

 and send down little suckers, which adhere firmly to 

 the leaf and decompose its tissue, or crawl among 



