200 
(G) Ferrous sulphate solution. 
(7) Cupric ferrocyanide mixture. 
(8) Cupric hydroxide mixture. 
(9) Potassium sulphide solution. 
(10) Flowers of sulphur. 
(11) Sulphosteatite powder. 
Numbers 1, 2, 5, 6, 9,10, and 11 were all preparations of more or less 
known fungicidal value. Numbers 3, 4, 7, and 8, prepared as below 
described, had, so. far as known, never been used in combating para¬ 
sitic fungi affecting plants.* Below are set forth the forinulte of the 
various solutions and powders, the amount given in every case being 
that used per plat at each treatment: 
(1) Bordeaux mixture. 
Cupric sulphate 
Lime (stone).... 
Water. 
5.22 grams . 
1. 2(1 grams. 
7, 572 grams 
0.184 ounce. 
0. 044 ounce. 
2 gallons. 
The cupric sulphate was dissolved in about a pint of water; the lime 
was then slaked in a separate vessel, enough water being added after¬ 
wards to make a thick whitewash. This was poured into the cupric 
sulphate solution and enough water added to make 2 gallons. Usually 
an excess of the lime milk was made up and just enough added to 
the copper solution to precipitate all of the cupric hydroxide. The 
presence of copper sulphate in solution, which always indicates an im¬ 
perfect preparation, was determined by means of a 5 per cent solution 
of potassium ferrocyanide. A few drops of this solution, when added 
to the Bordeaux mixture gives a brownish red precipitate if copper sul¬ 
phate in solution be present. If the reaction has been perfect no change 
whatever occurs. 
(2) Ammoniacal solution of copper carbonate. 
Copper carbonate... 
Aqua ammonia (26°) 
Water. 
2.34 grams . 
50 cc.. 
7,572 grams 
0.082 ounce. 
1.68 ounces. 
2 gallons. 
The copper carbonate was first mixed in sufficient water to form a 
thick paste; the ammonia was then added and the resulting liquid was 
diluted with 2 gallons of water. 
(3) Ferrous ferrocyanide ifiixture. 
Ferrous sulphate (exsiccatus). 
Potassium ferrocyanide (yellow prus- 
si ate of potash). 
Water. 
3.44 grams. 
9 grams. 
7,572 prams 
0.192 ounce. 
0.518 ounce. 
2 gallons. 
' *Lodeman, in Bull. No. 35, N. Y. Cornell Ag. Ex. Sta., used copper borate, but 
only as a commercial article, suspended in water. 
