8 BULLETIN 305, U. S. DEPAETMENT OF AGEICULTUEE. 



the toad eat? Feed it live snails, thousand-legged worms, spiders, 

 grasshoppers, crickets, beetles, cutworms, army worms, tent cater- 

 pillars. How does the toad differ from the tree frog? (Farmers' 

 Bui. 198.) 



Collect a number of quart bottles with as large mouths as possible. 

 Place in one of these cotton squares with specks on the side that have 

 just been shed, cover with some thin cloth and observe them daily 

 and study the developments. (Farmers' Bui. 512.) 



In another bottle place orange or grapefruit leaves that have white 

 dust, small scale-like specks smaller than a pinhead; thick, round- 

 bodied grubs with very short legs and with a bright red spot on the 

 back, or small white flies attached to the under surface. Study 

 developments. 



In another bottle place fall Irish potato vines that are infested 

 with beetles. Study daily to become f amiliar with the various stages 

 of development. Fresh leaves should be added from time to time 

 to furnish food. 



Attempt to answer these questions: 



(1) Where do house flies breed? 



(2) How long do they require to develop? 



(3) How many generations are grown in a season? 



(4) How are they dangerous? How prevented? 



(Farmers' Bui. 679.) 



Mount specimens of insects studied this month. (See Farmers' 

 Bui. 606.) 



Correlations. — Language lesson material is abundant. Describing 

 the toad, its habits and means of livelihood and recording observa- 

 tions with the insects studied provide ample subject matter for writ- 

 ten work. 



Drawings of the toad and the different stages of the insects studied 

 should be made. 



Exercises based on estimates of the number of insects destroyed 

 annually by the toad, the number of descendants from one house fly, 

 one boll weevil, one white fly, or one cattle tick in a year, and on 

 estimates of the damage done to the various crops by the descendants 

 of one of these insects in a year provide interesting correlation in 

 arithmetic. (See references for estimates.) 



Locate counties freed of cattle tick. Locate on the map the point 

 at which the boll weevil was introduced into this country. Indicate 

 on the map the part of the South infested with the boll weevil. 



FIFTH GRADE. 



Population studies in plants and animals of all kinds are continued. 

 Advanced studies with orchard and forest trees are taken up. Some 

 more detailed work with mammals and birds is undertaken and special 

 attention is given to economic insects and fungus growths. 



