Bejjort on the Experiments trith " Bovillie Bcu'delaise." 829 
green crystals of the sulphate of iron ; a mixture of the two 
sulphates reduced to powder has a very different colour from the 
blue of the copper sulphate. 
I The " Eclair " machine ' was employed in distributing the mixture, 
which it does in a fine spray, wetting, when properly applied, both 
surfaces of the leaf. 
The quantity of the 
mixture applied varied 
from 60 to 115 gallons 
{ per acre, according to 
I the amount of foliage. 
I Xo difficulty was ex- 
j perienced in getting an 
I ordinary farm labourer 
' to use the Eclair satis- 
factorily. The cost of 
labour in applying the 
mixture, including the 
expenses of carrying 
water, tubs, &c., to the 
tield, amounted to 5s. 
an acre for each dress- 
ing, estimating the 
day's wage at 3s. The 
mixture applied cost, on 
an average, 3s. Gd. an 
acre, the difference in 
the price noted in the 
Table being due to the ^ ^ 
different charges for The " Eclair • ilaoUine. 
carriage. The total ex- 
pense consequently came to, on an average, S.---. 6c?. per acre for a 
single dressing. This does not include the original cost of the Eclair, 
which is sold in London for 35.y. 
The mixture was first applied early in July to tlie plots at each 
I station indicated by A in Tal>le I. on page 831. These plots were 
treated with the view of seeing how far early and repeated applica- 
tions might prevent the disease in the plots, slmulcl it afterwards 
attack the rest of the crop in the fields in whicli they wore situated. 
A second application was made after the middle of the month, still 
before any disease had made its appearance. In two localities 
(Kent and Bedford) the mixture was applied a third time towards 
the middle of August, when the disease had made its apnearance in 
the fields. 
The plots marked B in the table were treated with the view of 
seeing how far a single application of the mixture might arrest or 
j cure the disease in potatoes which had already been attacked. One 
' For a description of the " Eclair " machine, see pages 232-3 of the present 
yolame cj the Journal. 
