1S4 TXSHCTUIDKS, rrXGK'lDKS, AND WKKD KILLETiS. 



Although the actioa of green vitriol on the grains of wheat is much 

 less injurious than that of blue vitriol, this action, ten times less 

 cryptogamicidic than the latter salt, forms no inducement to use it as 

 a substitute. Used ten times more concentrated than blue vitriol its 

 pecuniary advantages disappear. Henriot made interesting trials on 

 the pickling of seed-wheat. The seeds steeped for twenty minutes in a 

 1 per cent solution of green vitriol germinated quicker and more 

 uniformly, and produced more vigorous plants, than the unpickled 

 seeds sown in the same conditions. Besides the plants seemed less 

 sought after by insects than the check plants. On peas the increased 

 yield was 100 grammes more per square metre. Turnips also gave 

 an increased yield, and were not attacked by the fly (altises). Henriot 

 recommends pickling cabbage seed, radish seed, turnip seed, peas, 

 hai-icots, salad, etc., seeds to secure quicker gennination and a bigger 

 yield. 



Pi(ccinla (rust). — The uredospores do not germinate after fifteen 

 hours' immersion in a 13-9 per cent solution of green vitriol. The 

 aecidiospores, more sensitive, do not germinate after immersion for the 

 same time in a 1"39 per cent solution (Wuthrich). Used by Galloway 

 to combat rust of winter wheat, green vitriol was found incapable of 

 restricting that disease, but used in 0-5 per cent solution on young 

 plants before its appearance, this disease was considerably lessened. 

 Used as manure, green vitriol completely prevents this disease because 

 it imparts more vigour to the plant. The numerous experiments of 

 Phillipar and Sance in France, of Griffiths in England as well as those 

 of Saccardo, have shown green vitriol to be a preventive. The doses 

 to apply on the large scale do not exceed 2 cwt. per hectare, say 88 lb. 

 per acre ; this manure is spread on the soil in the spring the same time 

 as the seed is sown. 



Polyporus (polypores).- — Prillieux advises to destroy Pohjporus 

 ftdvus, Fries, which lives on fruit trees, and particularly on the olive, 

 the same treatment for anthracnose. After having cut out the fungus, 

 the bark and wood already attacked is removed, then the bared surface 

 is moistened with a 50 per cent solution of green vitriol, rendered more 

 active by the addition of 2 per cent of sulphuric acid. The wounds 

 are afterwards protected against fresh infection by covering them with 

 a layer of tar. Sirodot advises this operation not to be done in 

 autumn, which is that of the fructification of the parasite, and to choose 

 warm dry weather as much as possible. 



Exoascus deformans, Fuckel (leaf curl of the peach). — By treating 

 peaches with green vitriol according to Eassiguier's method, and re- 

 peating it at intervals, Andre caused the rust to vanish completely. 



ErysipJic comviunis, Wall, (mildew of the pea). — Deneuville advises 

 green vitriol as a pieventive used thus: Sow the peas and cover 

 them in April with a green vitriol in powder, then give the ground 

 a slight but uniform touch with the harrow. Excellent plants which 

 rise up well and free from blight are thus obtained. 



Nectria ditissima, Tul. (canker of the pear, the apple, and the beech). 

 — Prillieux recommends, to kill this fungus, and to protect wounds 

 against its invasion, the process just described for the destruction of 



