254 FUNGOID PESTS OF CULTIVATED PLANTS. 



Another form : Water fifty gallons, sulphuric acid one pint, iron sul- 

 phate twenty-five pounds. Pour the sulphuric acid upon the iron sulphate, 

 and then add by degrees the fifty gallons of water. 



A metal vessel must not be used in the preparation, as it would be acted 

 upon by the sulphuric acid. 



This mixture may be used with great advantage, where a disease has 

 previously existed, to destroy the resting spores. In spraying fruit trees 

 &c. it should be done in the winter, otherwise the foliage would be com- 

 pletely destroyed. 



Jeyes's Fluid. Watering with Jeyes's fluid in the proportion of one 

 ounce to a gallon of rain water is beneficial in sterilising the soil, which 

 should be thoroughly wetted and allowed to remain a week before any- 

 thing else is planted. 



Liquid Grison is prepared by boiling six pounds of sulphur and three 

 pounds of lime in six gallons of water, until the whole is reduced to two 

 gallons. Allow it to settle, pour off the clear liquid, and bottle it until 

 used. For use mix one part of the liquid with one hundred parts of water. 



" Paraffin. A wineglassful to two gallons of water has been used with 

 effect to check the spread of the Chrysanthemum rust, and would doubt- 

 less be applicable to other rusts. 



Potash Permanganate. This is the well-known fluid called " Condy's 

 fluid." It is more economical to buy the potassium permanganate, in 

 the form of crystals, which dissolve readily in water. The solution 

 should be pale-rose colour. 



It has proved effectual in arresting the spread of rust, and was 

 employed successfully to Hollyhock seedlings when the brand was in full 

 activity. Busted Carnations may be sponged with it. 



Potassium Sulphide. Dissolve one ounce of potassium sulphide, 

 popularly known as " liver of sulphur," in a quart of hot water, then 

 make it up to two and a half gallons with cold water. Useful to check 

 the spread of an epidemic, and proved successful against Chrysanthemum 

 rust. 



Sulphate of Copper Solution. Dissolve one pound of sulphate of 

 copper in twenty-five gallons of water, and spray with the solution. 



For notes on " Soda Bordeaux," " Formalin," and " Kerosene Emul- 

 sion," see JOUBN. R.H.S. xxviii. 1904, p. 654. 



POWDERS 



may be applied by dredging from a flour dredger, or pepper pot, or 

 enclosed in a canvas bag. 



David's Powder. Dissolve four pounds of sulphate of copper in as 

 little water as possible. Slake fifteen pounds of lime in the smallest 

 amount of water necessary, then mix the two preparations thoroughly 

 and let the compound dry, after which it is crushed and sifted and applied 

 in the form of powder. 



