284 APPENDIX A. USEFUL INFORMATION. 



4.— McDougal's Insecticide. 



One gallon of emulsion mixed with a few gallons of water and then made up to 60 

 to 100 gallons. 



5.— Rosin Compound. 



Powder 2 pounds of rosin and 1 pound of washing soda (sodium carhonate) 

 crystals. Place these in a kerosene tin or large metal vessel, with enough water to cover 

 them, and hoil. 



Continue boiling till both are dissolved and then slowly add cold water to the 

 steadily boiling fluid. Water is to be added, a very little at a time, for fear of chilling 

 the liquid, and the mass should gradually be brought up to 2 gallons. The liquid 

 changes as the boiling proceeds, becoming thick and soapy ; after boiling for half an 

 hour or longer, the liquid becomes clear, thin, of a deep brown colour. Continue boil- 

 ing, pouring a few drops of the mixture into cold water at intervals ; at first the wash 

 on mixing with cold water forms a slightly milky opaque fluid, but after some minutes' 

 further boiling, it fonns a clear amber liquid on being mixed with cold water. 



This is tlie test of the liquid being finished and it should on cooling remain clear. 

 To this stock solution 6 gallons of water may be added to make the strong wash, 10 

 gallons to make the normal wash. One pound of rosin is used for every 4 to 6 

 gallons of wash required, and half as much soda. The wash liceps indefinitely if 

 properly prepared, and it is best to keep the stock solution and dilute it as required. 



6.— Rosin Wash. 



Powder 3 pounds of rosin and add it to half a ponnd of caustic soda (98 per 

 cent.) dissolved in half a gallon of water in a kerosene tin. Boil and when the rosin is 

 dissolved add half a pint of fish oil. Continue boiling, slowly adding cold water, till 

 the mixture amounts to 3 gallons. If the mixture is then a clear thin brown 

 liquid, which mixes with water producing no milkiness, it is finished and may be 

 removed from the five. Dilute with 12 gallons of water to make wash ready for 

 use. One pound of rosin is used for every 5 gallons of wash required. If caustic 

 soda of 98 per cent, purity cannot be used, use a proportionate quantity of 70 per cent. 

 (f lb.) or lower grade caustic. 



7. — ^Tobacco. 



Soak 2 lbs. of tobacco in 2 gallons of water for 24 hours or boil for half an hour. 

 Dissolve ^ lb. bar soap or 1 pint of soft soap in the mixture. This is the stock 

 solution. Dilute with seven parts of cold water. 



8. — Sulphur. 



Mix 20 lbs. of ground sulphur or flowers of sulphur with 80 pounds of siftfed or 

 slaked lime or wood ashes. 



An alternative is to boil 5 pounds of sulphur and 5 pounds of lime in water and 

 make np to 40 gallons with water. 



Another formula is to mix 8 pounds of sulphur with 10 pounds of soft soap in 

 boiling water and make this up to 40 gallons with cold water. 



