176 MILDEW PEEVENTED BY WATERING. 



even likely to frustrate the object for which, it is used. To meet- this 

 difficulty subterranean irrigation, by means of pierced pipes filled -with 

 fluid under pressure, has been advocated by Mr. Chadwick, Mr. 

 Kennedy and others ; and there is no doubt that it is the most effectual 

 and xmobjectionable of all methods proposed for communicating fluids to 

 the soU. It is, however, to be feared that cost will always be a bar to 

 the adoption of this plan. 



Mildew, wHch is so often produced by cold dry air acting 

 upon a delicate surface of vegetable tissue, is completely pre- 

 vented in annuals by Yerj a bundant watering . The ravages of 

 the Botrytis effusa, which attacks Spinach; of Acrosporium 

 monilioides, which is found on the Onion ; and the mildew of 

 the Pea, caused by the ravages of Erysiphe communis, may all 

 be stopped or prevented by abundant watering in dry weather. 



Mr. Enight first applied this fact to the securing a late crop of peas for 

 the table, in the following manner ; — The ground is dug in the usual 

 way, and the spaces which will be occupied by the future rows are well 

 soaked with water. The mould upon each side is then eoUeoted, so as 

 to form ridges seven or eight inches above the previous level of the 

 ground, and these are weU watered; after which the seeds are sowed, 

 in single rows, along the tops of the ridges. The plants very soon 

 appear above the soil ; and grow with much vigour, owing to the great 

 depth of the soU, and abundant moisture. Water is given rather pro- 

 fusely once in every week or nine days, even if the weather proves 

 showery ; but, if the ground be thoroughly drenched with water by the 

 autumnal rains, no further trouble is necessary. Under this mode of 

 management, the plants wUl remain perfectly green and luxuriant till 

 their blossoms and young seed-vessels are destroyed by frost, and their 

 produce will retain its proper flavour, which is always taken away by 

 mUdew. [Hort. Trans., ii. 87.) 



