jf^Ae Wobxirn Exjjenments on “ Potato Disease.” 
783 
Series 11. “Schoolmaster.” — There was only a little disease, 
which was sliglitly lessened by the early application. The crop was, 
however, decidedly lieavier on the untreated plot. 
Series 12. “Victoria.” Here disease occurred, and the dress- 
ings succeeded in lessening it, more especially the early dressing, 
there being only 2 ‘6 per cent, of disease, as against 9’7 per cent, on 
the untreated plot. The crop also showed a remarkable increase 
where the dressings were put on, the early one being very successful 
indeed. 
With the “ medium ” and “ late crops ” it would appear that the 
dressings, though successful in reducing the amount of disease 
w’herever it occurred to any marked extent ^viz., in “Regent,” 
“ White Elephant,” and Victoria”), did not in any case prevent 
it altogether. The early application was decidedly moi’c successful 
than the later one. There was no case in which the sugar admix- 
ture was more efficacious than that without it. As to gain or loss 
of crop, out of seven cases, there are three of loss and three of gain, 
wdiile in the seventh (“ Regent ”) gains and losses are balanced. 
There is only one clear case in -which the late dressing has done 
any marked good. 
Taking all the varieties — early, medium, and late — together, there 
are, as the result of the dressings, good paying gains of produce in five 
cases out of twelve, as against four cases of loss, and three cases 
where gains and losses about balanced. Further, out of seven cases 
in which disease occurred, the dressings succeeded in five instances 
in reducing the amount of disease, while in no case was it increased. 
Conclusions. — To sum up these results, the following conclusions 
may be drawn ; — 
1. That neither the ordinary bouillie bordelaise, nor the bouillie 
bordelaise sucrie, had an entirely preventive effect, though both of 
them, when applied early and before disease appeared, succeeded 
in lessening the extent to which disease proceeded. 
2. That neither dressing when applied after disease appeared 
had any material effect in curing the disease. 
3. That the addition of sugar to the ordinary bouillie borde- 
laise did not constitute any advantage, but only added to the 
expense. 
4. That the effect of either dressing upon the w'eight of produce 
was uncertain, but tended in the majority of cases to increase rather 
than to diminish the crop. 
5. That, in view of the lessening of disease, and the increase, in 
the majority of cases, of the crop, the early application of the ordi- 
nary bouillie bordelaise is to be recommended as a remunerative one. 
It must be borne in mind that the past season was one in which 
disease was not by any means prevalent, and that disease appeared 
very late in the year. Seeing that the early dressing was most effec- 
tual where disease occurred the most, it is a fair deduction that 
in a season when disease showed itself badly the dressing would 
give even more favourable results than those now set forth. 
J. Augustus Voelcker. 
