146 



DETAILS OP THE EXPERIMENT. 



The trees selected were of the Fameuse variety planted fifteen years ago, and 

 having made good growth are now of fair size. Six trees were set apart for each test. 

 Three applications were made in each case, the first one on the 22nd of May, when 

 the leaves were about half-formed and the blossoms just beginning to open. At the 

 time of the second application, 8th June, Paris green at the rate of 1 lb. to 200 

 gallons of water was added to each mixture when fully diluted. This was applied to 

 three trees in each lot, while the remaining trees were left as checks. On the 20th 

 of June they received the third treatment, and in the same manner as that on 22nd 

 May. The apples were carefully hand-picked and graded, the per cent of wormy 

 fruit in a representative bushel of each class being ascertained by actual count, and 

 the total percentages deduced therefrom. 



FORMULA. 



The following are the formulae used in the experiment detailed above, of which 

 the individual results are shown in the tables. 



1. Solution. 



Carbonate of Copper 1^ oz. 



Ammonia 1^ pts. 



Water 25 galls. 



Paris Green (added in second application) If oz. 



2. Suspension. 



Carbonate of Copper 1^ oz. 



Water 25 galls. 



Paris Green (added in second application) If oz. 



A slightly increased quantity of Paris green was used in this instance, as with- 

 out the ammonia solvent there is less danger of injuring the foliage. 



3. Unwashed Solution. 



Has the constituents of No. 1 present in the same quantities. 

 In Bulletin No. 10 the following directions were given, which it is thought well 

 to repeat here : — 



home manufacture of copper carbonate. 



As the precipitated form of carbonate of copper is not always obtainable from 

 druggists, directions are herewith appended for the easy preparation of this material 

 at a cost much less than the usual wholesale price. 



In a vessel capable of holding two or three gallons, dissolve 1^ pounds of copper 

 sulphate (blue vitrei) in 2 quarts of hot water, using the crj^stalline form. This will 

 be entii-ely dissolved in fifteen or twenty minutes. In another vessel dissolve If 

 pounds of sal soda (washiog soda), also in 2 quarts of hot water. When completely 

 dissolved pour the second solution into the first, stirring briskly. When effervescence 

 has ceased fill the vessel with water and stir thoroughly; then allow it to stand five 

 or six hours, when the sediment will have settled to the bottom. Pour off the clear 

 liquid without disturbing the precipitate, fill with water again and stir as before ; 

 then allow it to stand until the sediment has settled again, which will take place in 

 a few hours. Pour the clear liquid off carefully as before, and the residue is car- 

 bonate of copper. Using the above quantities of copper sulphate and sal soda, there 

 will be formed 12 ounces of copper carbonate. 



Instead of drying this, which is a tediouE, operation, add four quarts of strong 

 ammonia, stirring in well; then add sufficient water to bring the whole quantity up 

 to 6 quarts. This can be kept in an ordinaiy two-gallon stone jar, which should be 

 closelv corked. 



