OF 



UNIVERSITY 



/-'s- 



HORTICULTURIST'S KULE-BOOK, 



CHAPTER I. 



INSECTICIDES. 



THE results obtained from the use of any insecticide 

 or fungicide depend upon the operator. Timeliness, 

 thoroughness, and persistence are the watchwords of 

 success. It is easier to keep an enemy away than 

 to drive him away. The worst foes are often the 

 smallest ones ; and the injury is often done before 

 they are detected. Be ready, and begin early. 



Insecticides are of three general types, liquid 

 spray, powder, and fumes or vapor. 



Arsenic. Known to chemists as arsenious acid, or white oxide 

 of arsenic. It is considered an unsafe insecticide, as its 

 color allows it to be mistaken for other substances ; but 

 in its various compounds, it forms our best insecticides. 

 From 1 to 2 grains, or less, usually prove fatal to an adult ; 

 30 grains will usually kill a horse, 10 grains a cow; and 

 1 grain, or less, is usually fatal to a dog. In case of 

 poisoning, while awaiting the arrival of a physician, give 

 emetics, and, after free vomiting, give milk and eggs. 

 Sugar and magnesia in milk is useful. 



B 1 



