s 
276 Report OF THE HorTICULTURAL DEPARTMENT OF THE 
centage of scabby fruit than where one part of lime was used to 
one part of copper sulphate. This result at least greatly strengthens 
the supposition, on theoretical grounds, that an excess of lime may 
be of value in wet weather in preventing too rapid dissolving of 
the copper sulphate. 
Tables VIII and IX show that in dry weather the double. quan- 
tity of lime hinders the fungicidal action of the bordeaux mixture. 
The Baldwins in the eight plats, Table VIII, do not show marked 
differences, but the fact that in the comparison of two parts lime 
with one part, in each case, the percentage of scab is less in the 
plats in which but one part is used is very significant. With the 
Rhode Island Greenings, Table IX, the differences are quite marked 
in favor of the one part lime to one part of copper sulphate mixture 
in dry weather. 
The experiment is a very strong confirmation of the statements 
of Lodeman, Clark, Schander and others, as noted above, that in 
dry weather an excess of lime is detrimental to the fungicidal prop- 
erties of bordeaux mixture. 
EXPERIMENT IV.— EFFECTS OF BORDEAUX MIXTURE MADE W1ITH 
VARYING QUANTITIES AND VARYING PROPORTIONS OF COPPER 
SULPHATE AND LIME. 
(a) As to injury.—The plats must be again subdivided to give 
fair comparisons. Taking the Rhode Island Greening tree in each 
plat sprayed during a rain, Table IX, page 275, the figures show 
that, with one exception, in the plats where equal quantities of 
copper sulphate and lime were used, the greater amount of cop- 
per sulphate the greater the injury. The exception is the un- 
explainable, abnormal 22 per ct. in the 1-1-50 plat. In the plats in 
the series where one part of copper sulphate and two of lime were 
used, the amount of injury increases markedly with the increase 
in the quantity of copper sulphate. Despite the capriciousness of 
bordeaux injury in rainy weather, the data given show, with the 
exception of the 22 per ct., that doubling the quantity of copper 
sulphate practically doubles the amount of bordeaux injury. 
Taking the remaining four trees in the eight plats, two Bald- 
wins and two Rhode Island Greenings, sprayed during dry weather, 
Table X, the experiment shows again that the more copper sulphate, 
the more injury. In each of the two series in this experiment, 
divided in accordance with the proportion of lime used, there is an . 
increase in injury, though not as uniform as in the case of the 
trees sprayed in rain, with the increase of the copper salt. 
