64 The Potatoe Plague. 
quently. to powder over with such a mixture, a soil in which 
diseased potatoes have grown, is a good operation for destroy- 
ing in that land the germs of the scourge. The operation 
ought to be recommended everywhere. 
The storing of potatoes from fields that have this year been 
attacked by the scourge, in cellars, caves, &¢., will certainly 
be to deposit the spawn of the mushroom in those very places. 
They should, therefore, before receiving the potatoes, be 
thoroughly cleansed, and scoured with lime, or ground char- 
coal scattered over the bottom, (and on the potatoes as they 
are stored,) which will conclude the series of operations, the 
most rational and the most certain for destroying, 7f possvble, 
the evil at its root. 
C. H. Morren, 
Member of the Royal Academy of Sciences. 
Liege, August 14, 1845.” 
The Journal of the Royal Agricultural Society, sixth vol- 
ume, contains an article on “The prevention of eurl and dry 
rot in potatoes,’ by II. S. Thompson, which is valuable and 
interesting as it contains the result of extensive observation 
and experiments on the subject, for the last five years. The 
editor of the New England Farmer thinks that “the disease 
therein described is analogous, if not identical with the one 
so prevalent in many sections of our own country,” and, he 
adds, “it may vary in its effects in different soils, seasons, or 
climates.” Mr. Thompson commences his article by first 
rocntioning the results to which he has been led, which are: 
“That curl and dry rot are caused by leaving the pota- 
toes intended for seed in the ground until ripe, and that, on 
the other hand, these diseases may be prevented by taking up 
the seed potatoes whilst the tubers are unripe and the tops 
still green.” 
1840. “Waving had my attention strongly drawn to the 
