30 BULLETIN 258, U. S. DEPARTMENT OP AGRICULTURE. 



Class assignment. — Duggar's, pp. 272-276. Supplement the lesson 

 with notes from Farmers' Buls. 444, 459, and 463; Alabama Press 

 Buls. 55 and 56. 



Practical exercises. — (1) Bring to school a bottle or can of water 

 containing wrigglers (wiggle tails) and cover the surface of the 

 water with a layer of oil. Study developments and take notes. (2) 

 Drain all pools about the home or the school, remove all discarded 

 vessels, and screen water barrels and tanks. (3) Secure and bring 

 to school in a closed vessel some material containing eggs or larvae 

 of flies. Examine carefully each day and take notes on the develop- 

 ments. (4) Make a fly trap by instructions found in Alabama Press 

 Bui. 56. 



Correlations. — Language and drawing: Write an account of the 

 life history of the fly and make drawings of each stage. Make a 

 drawing of a malaria mosquito at rest. Arithmetic : A female fly that 

 survives the winter lays four batches of 120 eggs each. Sixty eggs of 

 each batch produce female flies. They in turn lay four batches of 

 120 eggs each of which 60 produce female flies. Reproduction con- 

 tinues at this rate through 12 generations in a season. Find the num- 

 ber of flies produced in the twelfth generation. Emphasize the im- 

 portance of destroying flies in March. 



LESSON FIVE. 



subject: insects, topics: (i) insect defined; (2) insect growth; (3) how 



insects feed. 



Insects defined. — What is an insect ? The principal parts. 



Insect growth. — Insects developing without much change, stages in 

 an insect's life, transformation from caterpillar to butterfly. 



How insects feed. — Biting and sucking. 



Class assignment. — Duggar's, pp. 246-256. Supplement with notes 

 from Farmers' Bui. 127 and Alabama Experiment Station Bui. 139. 



Practical exercises. — (1) Look for adult boll weevils, peach 

 borers, plum curculios, and potato beetles. Make and mount a col- 

 lection of insects this month. See Farmers' Bui. 606. (2) Club 

 members should examine carefully their vegetables and plan to com- 

 bat insect attacks. 



Correlations. — Language and drawing: Describe and draw the 

 several insects collected and mounted. History: Have each pupil 

 of the class write an account of each insect as to date of introduction 

 into the community, damage done, spread, and methods of com- 

 bating. Arithmetic : Develop problems to determine damage done by 

 insects the previous year based on community estimates. 



