198 MISSOURI STATE HORTICULTURAL SOCIETY. 



takes in his left hand while with the ri2;ht, with a small whisk or 

 broom, he sprinkles or spatters the leaves, taking care to avoid touch- 

 ing the grapes with the compound. No danger to the person need be 

 apprehended." 



" With Mr. Johnston 50 litres of the mixture have been sufficient 

 for the treatment of 1,000 vines.* The treatment has been applied 

 from the 10th to 20th of July; at some points it has been repeated a 

 second time, end of August, but without marked advantage. It is 

 shown that a single application is sufficient. The mixture, when it 

 has dried, adheres well to the leaves. After the treatment the vines 

 have gone through several heavy thunderstorms at the beginning and 

 end of August, and frequent rains in September. Notwithstanding 

 this, one can today easily recognize on half of the leaves the spots 

 where they have been touched by the compound, but even those 

 leaves which have not retained the least trace thereof are in as good a 

 state as those which still show the spots," 



'' It is not necessary that the leaves be entirely covered with the 

 preserving mixture. I venture to say that a single splash even on a 

 leaf will be sufficient." 



Prof. Millardet insists upon a timely application and as a prevent- 

 ative treatment, saying that those who waited until their vines were 

 already rather seriously attacked reaped much less benefit from the 

 operation. 



In concluding Prof. Millardet says: "There is a last important 

 point to be considered. Notwithstanding all care, it will happen that 

 some drops of the coppery mixture will fall on the grapes. Will the 

 copper be found again in the wine ? And if it should be found, would 

 it be in quantities sufficient that health could be affected thereby? 

 My colleague, Mr. Grayon, has promised me his help to study this 

 question. A trial made by him on SOO grammes (nearly 2 lbs.) of the 

 fruit taken from treated vines failed to reveal the presence of copper 

 in absolutely certain manner. The researches in this direction will be 

 continued, and I hope to be able, before long, to lay their results 

 before the academy." 



In a discussion of this question at a meeting of the Agricultural 

 Society of the Herault, at Montpelier, the view is expressed that any 

 danger to health need hardly be feared in consequence of the infinitely 

 small quantity of the coppery compound which might adhere to the 

 fruit, if proper care has been bestowed while applying it to the vine. 



* For our American vines here with their larger spread of vegetation, espe- 

 cially where grown on trellis, this quantitj^ would sufficeprobably for only one-half 

 or one-third that number of plants. 



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