fluid ounces of acid and 2^ times as many fluid ounces of water as 

 ounces by weight of cyanid. Mix water and acid in an earthern or 

 granite ware jar, then by loose bag and string drop in the cyanid 

 after closing tightly the place to be fumigated. Leave closed 40 

 minutes, then open from the outside and air for at least ten minutes 

 before entering. 



26. SULFUR. 



J^or Empty Houses. 



Close the house tight and burn 200 grams (about 6 oz.) to 1000 

 cu. ft. of space. Keep the house closed at least twelve hours. 



27. SULFUR. 



For Houses toith Growing Plauts. 



Evaporate a small quantity in a kettle over a kerosene stove, tak- 

 ing care that it does not catch fire. Or, paint some of the heating 

 pipes occasionally with a mixture of sulfur and oil. 



TREATMENT OF GREENHOUSE PLANTS. 



On general principles the practice of spraying greenhouse plants 

 cannot be recommended, since the control of the diseases of green- 

 house plants consists to a large extent in maintaining favorable or 

 hygienic conditions. 



When greenhouses are about to be emptied, or before replanting, 

 systematic fumigation can be practiced to good advantage with Nos, 

 25 or 26. 



Red Spiders and Mites. 



Flowers of Sulfur one ounce. 



Water one gallon. 

 Mix well and spray over infested plants. Soapsuds may be used 

 instead of the water with good results. Formula No. 23 has also 

 been recommended for these insects. 



