OF DWARF FRUIT TREE CULTURE. 97 



Apply warm as it thickens on cooling. Recommended for rose 

 mildew and plant lice. 



FUMIGANTS. 

 CARBON BISULPHATE. 



(Explosive Use With Caution.) 



Evaporate one pound of carbon bisulphate to every 1,000 cubic 

 feet of space. This is done by pouring the bisulphate into shallow 

 dishes placed in the upper part of the space to be fumigated, and 

 closing everything tightly and leaving it 24 hours. Then open and 

 ventilate for 10 minutes before entering or using anything that has 

 been fumigated. The vapor of carbon bisulphate being heavier than 

 air settles towards the floor. This treatment is effective for infested 

 grain, weevily seed, clothes moths, carpet beetles, etc., or any living 

 thing in closets, trunks or tight boxes where they may be placed for 

 treatment. CAUTION: DO NOT USE CARBON BISULPHATE 

 NEAR FIRE OR WHERE THERE IS MUCH HEAT, AS IT TAKES 

 FIRE AND EXPLODES EASILY, EVEN FROM A LIGHTED 

 PIPE OR CIGAR. 



HYDROCYANIC OR PRUSSIC ACID. 

 (Deadly Poison.) 



(For Nursery Stock.) 



Potassic Cyanide (98 or 99 degrees). 



Sulphuric Acid (1.83, sp. gr. commercial). 



Water. 



Multiply the number of cubic feet to be fumigated by .2 or .25, 

 giving the number of grams of cyanide for the house or box ; divide 

 the answer by 28.35, giving the weight of cyanide in ounces. Take 

 twice as many fluid ounces of acid and four times as many fluid 

 ounces of water as was taken in ounces by weight of the cyanide. 

 Mix the water and the acid in an earthenware or graniteware jar. 

 Then by a loose bag and string drop the cyanide into the acid after 

 closing tightly the place to be fumigated, with yourself safe from the 

 fumes outside. As soon as the cyanide touches the acid, fumes of 

 PRUSSIC xlCID ARE DEVELOPED, THE INHALATION OF THE 

 SMALLEST QUANTITY OF WHICH IS SURE AND SUDDEN 

 DEATH. 



