!I78 ANNUAL KKI'ORT OF THE Off. Doc. 



AMMONIACAL COPPER CARBONATi:. 



Copper caibouate, 4 ounces. 



Ammonia, 3 pints. 



Water, . . , 45 gallons. 



Make a paste of the copper carbonate with a little of the water. 

 Dilute the ammonia with 7 or 8 times its bulk of water. Add the 

 paste to the diluted ammonia and stir until dissolved. Add enough 

 water to make up to the 45 gallons. Let it settle and use the clear 

 blue liquid only. Do not make this up long before using as it loses 

 its strength on standing. It is used when the fruit is so nearly ripe 

 that Bordeaux mixture would produce stains if it were used. 



POTASSIUM SULPHIDE SOLUTION. 



(Liver of Sulphur.) 



Potassium sulphide, i to 1 ounce. 



Water, 1 gallon. 



Particularly good for surface mildews but loses its strength upon 

 standing, so should be used at once after making. 



SULPHATE OF IRON AND SULPHURIC ACID SOLUTION. 



Water (hot), 100 parts. 



Iron sulphate (green vitriol) as much as the water will dissolve. 



Sulphuric acid (commercial), 1 part. 



Make the mixture with much care, as heat is produced. Use on 

 plants when dormant only, applying with brushes or sponges, as the 

 solution is injurious to spraying machinery. 



CORROSIVE SUBLIMATE. 



This dissolves slowly and but slightly in water. The process may 

 be hastened by heating the water. 



GENERAL REMARKS. 



In the treatment of fruits by sprays it should be remembered that 

 the substances used are in almost every case poisonous. It is ac- 

 cordingly necessary to avoid spraying at times when fruit is nearly 

 ripe, both on account of the possibility of placing poison on the fruit 

 just before it is picked, and because of the danger of staining it, as 

 would be the case if certain solutions were used. 



Spraying solutions often need to be carefully strained, and it is 

 advisable to do this when putting them into the barrel or other re- 

 ceptacle from which they will pass through the spray pump. Noz- 

 zles will clog from larger lumps in the fluid, and care should be taken 

 to avoid this as far as possible. Every pump should have an agitator 



