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and, indeed, it is found as a matter of actual observation 

 and experience, that what is termed Potato-sick soil is that 

 in which the disease has hitherto been most destructive, thus 

 confirming, as it were beforehand, Mr. Smith's discoveries, 

 that the earth is the hiding-place of the resting-spores ; 

 that in due time they are roused to life, perish if they can- 

 not find a suitable matrix, such as the Potato plant, for 

 their development, and run through their transformations 

 and destroy the Potato crop, should it be within reach. It 

 therefore follows that a total change of ground annually, 

 which cultivators have found to be the best mode of in- 

 suring high quality, is also likely to prove the best safe- 

 guard against the Potato disease, old or new. D. T. Fish. 



[We advise burning the whole of the haulm and decaying 

 foliage as early as possible when attacked, instead of allow- 

 ing it to rot, and thus deposit the resting-spores, fresh and 

 sound, in the very best position for attacking tha crop the 

 following season. This might not get rid of all, but it 

 would lessen their numbers, and therewith the chances of 

 an attack. EDS.] 



