764 Report on Prevention and Cure, of Potato Disease: 
Vesper’s and at Mr. Brown’s. In no case were the B plots (late 
application) dressed more than once, namely, on the appearance of 
disease. 
The cost of the application varied, of course, with the number of 
times it was put on, and the amount of foliage. Bor an early first 
dressing from 100 to 120 gallons' were generally used, and 120 
gallons for a second early application ; for the B plots (late appli- 
cation) 120-140 gallons was the usual amount, but in one case (Mr. 
Healey’s “ Magnum ”), where the tops were very luxuriant, as much 
as 200 gallons was required. The sulphate of copper cost 18s. a cwt. 
and the lime about 10s. a ton, whilst the actual work of spraying 
may be put at 5s. per acre. A single application of 100 gallons per 
acre v/ould accordingly cost about 3s. 4c?. for material and 5s. for 
labour, altogether 8s. id. ; one of 120 gallons 9s. altogether, one of 
140 gallons 9s. 8cZ., and a dressing, first of 100 gallons and then 
another of 120 gallons, would cost 17s. 4cZ. per acre altogether. In 
the case of Mr. Vesper’s (Devon) experiments, owing to a misun- 
derstanding, the B plots (late application) were not dressed at all, 
and Mr. Giles, not having been informed of the appearance of 
disease, did not go there a second time. In one other instance, Mr. 
Giles did not dress the B plots (late application), namely at 
Mr. Brown’s, Pembroke Dock. Here no disease appeared at all on 
two of the three crops, and, thus, for the purposes of the inquiry the 
results might be omitted from consideration. As to the third variety, 
there was some uncertainty about the existence of disease, and Mr. 
Brown Aveighed the crops himself. The several experiments may 
now be treated of in their order. The particulars as to quantities 
applied, dates of application, &c., are given in the tables. In com- 
paring the gain in crop with the cost of dressing it will be seen that, 
taking the crop at about 55s, a ton all round, an increase of 4 cwt. 
per acre in crop Avould pay for a dressing costing 10s., and an increase 
of 7 cwt. per acre for one costing 18s. an acre. 
1. Kent. — Mr. Tltomas Scott’s Farm. Mr. Scott Avas anxious to 
try the difference betAveen giving the crop one and two dressings, 
applied early, and this was accordingly done. Disease appeared on 
the “Beauty of Hebron” and “SnoAvdrop” before it did on the 
“ Magnum.” It Avas less marked on the earlier than on the later 
dressed plots. The “ Magnum ” had particularly luxuriant haulms, 
and the tops of the A plots that had been tAvice dressed early 
remained growing after those on the other plots had died off. 
The potatoes Avere Aveighed on September 28. 
“Jkavty of Hebron .” — From the results obtained it Avill be 
noticed that there Avas not entire jDrevention of disease, but a marked 
diminution in it by the early dressing, for, Avhereas the untreated 
plot had 29 per cent, of diseased tubers, there Avas only from 2 to 4 
per cent, on the early-dressed plots. Together Avith this was an 
increase in crop of OA-er 3 tons per acre, and the application conse- 
quently paid excellently. The plot singly dressed had rather more 
disease, but a someAvhat increased crop. The late application seemed 
both to increase the crop and to lessen disease, but, while it paid 
well it Avas not so I’emunerative as the earlier dressing. 
