EXPERIMENTS WITH NuRsERY STOOK. 677 
21. Iron sulphide mixture: 
‘Ferrous sulphate exsiccatus (iron sulphate, dried)...grams 22.94 
Potassium sulphide (liver of sulphur).............. grams 91.76 
a aoa RRR Se PC gallon 1.00 
22. Zinc borate mixture: 
EE ie RUSTON IR As Sa grams 33.36 
Sodium borate (borax) ........ UT Put ae ane ak foes erams 33.36 
EEE ie es eave cin ae cleeree ny aCaey gallon 1.60 
23. Zinc ferrocyanide mixture: 
MM yee deel. Ee a grams 33.36 
Potassium ferrocyanide (yellow prussiate of potash), grams 66.72 
Ee ae AR SOR a tial Mae eating gallon 1.00 
24. Zinc silicate mixture: 
ITE 0h s6 ch) old uw ola sale ith 0) ays s! Fin obsha'€ w vet) « ats grams 33.36 
Sodium silicate (water glass) ....... AVICEAL eae grams 58.38 
ME ui wie sialic « du Celbipie ibe eye ete tie gallon 1.00 
25. Zinc sulphide mixture: 
Zinc sulphate ....... POAT hes scone rttet caso gee ot grams 33.36 
Potassium sulphide (liver of nt Seer UB aaiel Miata ok grams 66.60 
SE Noa lo) 3 20 Joi a) csc cise ct .e's we'acieieae ee en at oa gallon 1.60 
Six treatments were made with each of the above preparations 
and the effects on the seedlings carefully noted. The leaf-blight 
was present in sufficient quantity to test them thoroughly, and 
without going into details it may be said that only a compara- 
tively small number gave results which would encourage further 
trials. None were. successful in entirely preventing leaf-blight. 
The test points more strongly than ever to the remarkable nature 
of the cupric compound as found present in Bordeaux mixture 
_ ag a preventive of the disease. The details of this test will 
be published in a forthcoming number of the Journal of Mycoloy'y, 
together with full account of the preparation wnd composition 
of the various mixtures. 
