36 The Spraying of Plants. 



in ammonia the hydrates of copper deposited by the formula 

 given by Ferret. This would give a solution entirely free from 

 acid. 



Another of the many new remedies proposed during the year 

 1887 was brought forward l by Emile Masson. He recommended 

 the use of the carbonate of soda and the sulphate of copper, 

 and used these two materials in proportions varying from one 

 kilo of copper sulphate to one or two of soda carbonate, or sal- 

 soda. These were used in one hectoliter 2 of water. He said 

 that the fungicide did not burn foliage and that it spread evenly. 



Dr. G. Patrigeon, of Chabris (Indre), France, is probably en- 

 titled to the credit of having first conceived and put into prac- 

 tice the remedy proposed by Masson. He describes 3 it as the 

 "treatment of mildew with the hydrocarbonate of copper." 

 The substance was prepared by using 



Copper sulphate 4 kilos. 



Carbonate of soda 6 " 



Water 100 liters. 



He said it adhered to foliage fully as well as the Bordeaux 

 mixture, and thought it could be used twice as strong as recom- 

 mended above. 



A second preparation mentioned by Dr. Patrigeon was made 

 by dissolving with ammonia the precipitate formed in the pre- 

 ceding mixture. The proportions of the ingredients varied a 

 little as follows : 



Copper sulphate 1 kilogram. 



Carbonate of soda 1 " 



Ammonia 22 1 liter. 



Water 100 liters. 



The first two ingredients are each dissolved in four liters of 

 water in separate vessels. The soda carbonate solution is then 

 caref ully poured into the solution of copper sulphate, and when 

 all reaction has stopped the ammonia is added. As soon as the 

 precipitate is dissolved the solution may be diluted with the 



* Jour. &Ag. Prat. 1887, June 9, 814. 



8 A hectoliter is 26.416 U. S. gallons of 231 cu. in. ; or 22.009 Eng. Imp. gallons 

 of 277.26 cu. in. 



Jour. &Ag. Prat. 1887, June 23, 879. 



