14 GARDEN FOES. 



Carbolic Acid. — A dark, oily liquid; is sometimes 

 used as an insecticide; but, being a dangerous poison and 

 uncertain in strength, is best .avoided. Formalin, Lysol, 

 and Phenol are forms of this acid. Carbolic soap is some- 

 times used in solution with water as an insecticide. 



Potassium Sulphide (Liver of Sulphur).— An evil- 

 smelling chemical, much recommended as a remedy for 

 mildew and other minute fungi. It rapidly decomposes 

 when exposed to the air, so should be kept in tightly- 

 corked bottles. Discolours white paint. 



Copper Sulphate (Sulphate of Copperas).— A chemi- 

 cal sold in hard blue crystals; a corrosive, irritant poison. 

 The proper strength to use is 98 per cent. Must not be 

 dissolved in metal vessels, only in wooden ones. 



Iron Sulphate (Sulphate of Iron).— A chemical sold 

 in pale green crystals. Used in conjunction with sulphuric 

 acid and water. Must be mixed in wooden vessels only. 

 Is apt to destroy clothing, and is otherwise an objection- 

 able fungicide to use. 



Sulphur. — The form in which this is used as a fungi- 

 cide is " flowers of sulphur." It is composed of sulphur 

 precipitated into a fine powder, and i>s non-poisonous 

 unless heated over a fire. It may be used alone or in com- 

 bination with lime and salt. As a remedy for mildew it 

 is excellent. 



