PRESERVATIVE FLUIDS 653 



Fluid No. 1. — Formaldehyde 



Formaldehyde (formalin) 1 part 



Alcohol 5 parts 



Water, to make 50 parts 



To prepare one gallon of the fluid 3§ ounces of formaldehyde and 

 16 ounces of alcohol will be required, the remainder of the gallon 

 to be made up with water. 



The addition of a volume of hydrogen peroxide equal to that of the 



formaldehyde has been found to somewhat enhance the value of this 



fluid for red fruits. 



Fluid No. 2. — Boric Acid 



Boric (boracic) acid 1 part 



Alcohol 5 parts 



Water, to make 50 parts 



For one gallon, 3^ ounces of boric acid and 16 ounces of alcohol 

 will be required. 



The powdered form of boric acid is the most convenient to use. 

 There is no necessity to employ hot water, but stirring should be con- 

 tinued until complete solution is effected. 



Fluid No. 3. — Zinc Chloride 



Zinc chloride 3 parts 



Alcohol 10 parts 



Water, to make 100 parts 



For one gallon of fluid, 5 ounces of zinc chloride and 16 ounces of 

 alcohol will be required. 



Zinc chloride, of good quality, passes readily into solution ; any 

 white, flocculent precipitate that may appear is allowed to settle out, 

 and the clear fluid decanted. 



Fluid No. 4. — Sulfurous Acid 



Sulfurous acid 1 Part 



Alcohol 1 part 



W^ater, to make 10 Parts 



For one gallon, 16 ounces each of sulfurous acid and of alcohol 



will be required. 



Fluid No. 5. — Copper Sulfate 



Copper sulfate 2 parts 



Alcohol 10 parts 



Water, to make 100 parts 



