782 The Wohurn Experiments on “Potato Disease.” 
the early dressing, but not quite enough to pay for the application. 
With the late dressing there was a slight loss. 
Series 5. “ Early Puritan.” — Here there was a di.stinctly pay- 
ing gain, more especially from the early application. 
Series G. “ Early Rose.” — The result was similar to the last, but 
the gain was a much-increased one. 
Series 7. “ Dalmahoy.” — Again, a very large increase of crop, 
and, as before, more marked with the earlier application. 
On the whole, therefore, there is a gain of crop with four varie- 
ties out of five, the result being a paying one in three cases, while 
in a fourth the cost is just about met. With one variety only 
(“ Beauty of Hebron ”) was there a decrease. 
The general result of the dressing, even when disease has not 
appeared, is favourable to the adoption of the remedy, and goes 
to show that the early application is decidedly the more beneficial, 
while the addition of sugar to the mixture would not appear to 
be an advantage, but only an increased expense. 
Taking next the cases where disease appeared : — 
Series 2. “ Regent.” — There was a considerable amount of 
disease here. The application, whether of the ordinary bouillie 
hordelaise or of the same with sugar, had a marked influence in 
decreasing disease. Nevertheless it did not succeed in preventing 
it altogether. When dressed early, disease was lessened in the one 
case by 10 per cent, and in the other by 7 per cent. The addition 
of sugar proved of no advantage in lessening disease, but (somewhat 
inconsistently, it must be said) the crop was largely increased, and 
paid excellently for the application. The heaviest crop, however, 
was not moi’e than when no sugar was used. 
Series 8. “ White Elephant.” — Here again was a good deal of 
disease. The early application of the mixture decreased disease very 
largely, though it did not prevent its appearance ; the reduction 
was one from 26 per cent, down to 8 per cent. The late application 
was of only slight benefit, and evidently did not “ cure ” the disease 
when once it had appeared. As to the weight of crop, a slight 
decrease was shown with the earlier dressing, and a considerable 
one with the later. 
Series 9. “ Reading Giant.” — This was a remarkably heavy crop 
— the heaviest of all the series, amounting in each plot to over 15 
tons per acre. Disease was very slight, and there was a small 
increase of crop when either dres.sing was applied, which just paid 
for the cost. 
The above comprise the “ medium ” varieties. Coming next to 
the “ late ” varieties : — 
Series 3. “ Champion.” — There was hardly any disease at all, 
but the dressings, except in one case, lessened the crop. The sug.ar 
admixture was not more beneficial than the other. 
Series 10. “ Imperator.” — Disease occurred, but only to a small 
extent. The dressings did not lessen disease, but in each case in- 
creased the crop well above the cost incurred. The balance was in 
favour of the later application. 
