84 Diseases of the Potatoe. 
the evil merely by sending to another place for seed potatoes ; 
we should renew them frem the balls. This is a process 
requiring some patience, but we know of no easier method of 
entire renovation. We suppose renewal can be approached 
in successive plantings of unmatured potatoes. ‘These have 
often been strongly recommended for seed, not only for the 
“purpose of avoiding disease, but as a means of increasing the 
crop. It is manifestly contrary to what we regard as a gen- 
eral law in vegetation, that the most perfect seed produces 
the healthiest and most fruitful plants. There are, however, 
several reasons for believing that the potatoe may be an ex- 
ception to the general law. The vegetative principle is not 
so concentrated in the potatoe as in most other articles. It 
can be produced from the balls, the bulbs, or from sprouts 
which have grown in the cellar, or the earth. The vegeta- 
tive principle being so widely diffused, it may be reasonable 
to suppose, that the perfect ripening of the potatoe to some 
extent weakens its power of reproduction. That power after 
the complete maturity of the bulbs may beemore perfectly 
concentrated in the balls. “The experiment is easily made, 
and itis hoped that many farmers will this year plant pota- 
toes for the next year’s seeding as late as the 25th of June.” 
