236 INSECTS 



of eggs looks like a small flake of soot. In a day or two the eggs 

 will hatch and the tiny wigglers can be seen in the water. Watch 

 the growth of these wigglers. After several days they enter 

 the pupa stage and spend most of the time floating head down 

 from the surface. In a few days the adult mosquito emerges 

 from the old pupa case. The tub should be covered in order 

 to keep in the mosquitoes. 



2. In a dish of water containing wigglers add a drop or 

 two of kerosene. Notice how soon the wigglers die. This is 

 the method of destroying mosquitoes on a large scale in marshy 

 land. 



3. Destroy the plant lice, other soft insects, and scale in- 

 sects, which may infest house plants, by spraying with kerosene 

 emulsion. Make the emulsion by dissolving one ounce of soap 

 in a pint of boiling water and then adding one quart of kerosene. 

 Have no fire near when the oil is added. Only a small part of 

 this emulsion is used for a single spraying. For plant lice and 

 other soft insects dilute the emulsion with 1 5 or 20 parts of rain 

 water before spraying. For scale insects dilute with 10 parts 

 of water. 



REFERENCES 



Farmers' Bulletins: 397, Bees; 444, Remedies and preven- 

 tives against mosquitoes ; 447, Bees ; 450, Some facts about 

 malaria ; 453, Danger of general spread of the Gypsy and Brown- 

 tail Moths through imported nursery stock ; 459, House flies ; 

 503, Comb honey. 



