THE ESSENTIALS OF AGRICULTURE 



of alcohol. Adult insects should be pinned and kept in a small box 

 such as an empty cigar box. 



4. A study of the life history of the cabbage butterfly. This work 

 may begin either in the fall or in the spring. The cabbage butterflies 

 should be collected and one pair placed in each of a number of 

 screened breeding cages. Each cage should contain a small potted 

 cabbage plant or fresh cabbage leaves standing in water. 



By close observation the full life cycle may be seen, including 

 egg, larva, pupa, and adult ; the habits and structures may be deter- 

 mined ; and a collection illustrating the life cycle may be prepared. 



Other insects may be studied in similar ways. 



REFERENCES 



CHITTEXDEX, F. H. Insects Injurious to Vegetables. Orange Judd 



Company. 

 COMSTOCK, J. H. Manual for the Study of Insects. Comstock Publishing 



Company. 



KELLOGG, V. L. American Insects. Henry Holt and Company. 

 SAXDERSOX, E. D. Insect Pests of Farm, Garden, and Orchard. John 



Wiley & Sons. 

 SAXDERSOX, E. D., and JACKSOX, C. F. Elementary Entomology. Ginn 



and Company. 

 SLIXGERLAXD, M. V., and CROSBY, C. R. Fruit Insects. The Macmillan 



Company. 



