THE LIVING ENEMIES OF CROPS 57 



of any druggist. To use it, dissolve it in water, putting 

 10 grams of Paris green and 10 grams of lime in 6 liters 

 of water. It should be remembered that a poison for 

 insects is usually poisonous for persons. In handling 

 Paris green be careful not to get it on your hands and 

 in this way get it into your mouth. However, there 

 is one substance, buhac, or Persian insect powder, which 

 gets rid of insects quickly, and which is perfectly safe to 

 use. It is made from a plant called buhac, which could 

 be cultivated in the Philippines. 



Kerosene Emulsion. It is impossible to poison the 

 scale insects and other sucking insects. They do not 

 eat leaves, but push a sucking tube inside the leaf, and 

 suck the juice out. But they can be easily killed by 

 spraying over them some kerosene emulsion. To make 

 this, mix 2 liters of kerosene with 10 liters of water, and 

 200 grams of soap ; mix these away from the Jire while 

 the water is boiling hot, and beat or stir the mixture until 

 the water and oil do not separate. It is sometimes 

 necessary to re-heat the mixture because it cools before 

 it is perfectly mixed. Blowing air into it with the spray- 

 ing pump is an easy way to mix it well. For use on a 

 larger scale, make a stronger solution of the oil, and 

 dilute it as it is to be used. To make this strong solu- 

 tion, dissolve i kilo of soap in 5 liters of boiling water, 

 and stir in 10 liters of kerosene, boiling and stirring 

 until they will not separate. // is not safe to do this in 

 a house. Unless the mixture is well made, the kerosene 

 will kill the plants. 



