GENERAL PRACTICE. DISEASES. 2 43 



dissolving 1 pound of sulphate of copper in 25 gallons of water, or the " Eau Celeste, 

 modified formula." The object is to destroy any spores that exist on the young shoots 

 and scales of the buds, or lodging in the crevices of the bark. 2. As soon as the petals 

 have fallen, spray with ammoniacal carbonate of copper solution. 3. If the weather 

 should be moist and cool, consequently favourable to the development of the scab fungus, 

 repeat the application of the ammoniacal carbonate of copper solution two or three times 

 during the summer at intervals of a fortnight to three weeks. 4. In the case of trees 

 that in previous years have been infested with scab fungus in their blossoms, spray 

 with Eau Celeste just before the blossoms open, and if the weather be favourable, proceed 

 as in 3 ; but if the season be cold and wet, spray as soon as the petals have fallen with Eau 

 Celeste, and repeat two or three times at intervals of 12 to 15 days. Ammoniacal carbo- 

 nate of copper solution is not so beneficial when rains are abundant and frequent during 

 June and July as the Eau Celeste. 



In preparing ammoniacal carbonate of copper solutions, Mr. E. S. Goff advises 

 " 1J ounce of precipitated carbonate of copper to 1 quart of ammonia," because, 

 " if more is added it settles to the bottom without dissolving." Professor Saunders, 

 of Ottawa, gives the following recipe for making carbonate of copper : " Dissolve 

 separately in warm water 1 pound of sulphate of copper and \\ pound of washing 

 soda ; mix the two solutions, when carbonate of copper will be precipitated ; then pour 

 off the water/' 



Mr. Galloway, in Bulletin No. 4, 1891, furnishes the following directions for 

 manufacturing copper carbonate, which maybe usefully cited : "In a tub or barrel 

 dissolve 6 pounds of copper sulphate in hot water. In another suitable vessel 

 dissolve 7 pounds of soda in hot water. When the two solutions are cool, pour the 

 second slowly into the first ; then add water until the tub or half-barrel is full. Stir the 

 solution thoroughly and let it stand for 24 hours ; then siphon off the clear liquid and 

 add fresh water. Stir again, and again allow the solution to stand 24 hours ; siphon off 

 the clear liquid as before ; then remove and dry the sediment, which is carbonate of 

 copper. Using the above quantities of copper sulphate and sal soda, there will be formed 



3 pounds of copper carbonate." 



Bordeaux Mixture:" Sulphate of copper, 6 pounds; fresh burned or quick lime, 



4 pounds ; water, 22 gallons. Powdered copper dissolves the most freely. Dissolve the 

 sulphate of copper by placing it in a tub with 3 or 4 gallons of water, stirring this until 

 the water becomes blue. Pour the blue solution into an empty tub ; then porr 3 or 4 



n2 



