The Potatoe Plague. 77 



extra supply of food ; potatoes, therefore, grown on such soil, 

 will be in a growing state when those on old-going land will 

 be quite ripe, and if harvested together the former will be 

 unripe and make good sets. It is very probable, however, 

 the more abundant supply of all the elements of nutrition to 

 be found in fresh soil may have a considerable effect, and 

 concur with the under-ripening of the seed in producing a 

 healthy and vigorous plant. 



