8 BULLETIN 305, U. S. DEPARTMENT OF AGRICULTURE. 
a)! 
the toad eat? Feed it live snails, thousand-legged worms, spiders, 
erasshoppers, crickets, beetles, cutworms, army worms, fea cater- 
pillars. How does the toad differ from the tree fron? (Farmers’ 
Bul. 196.) 
Collect a number cf 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’ Bul. 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 
joes ayaenie. 
In another bottie place fall Irish potato vines that are infested 
with beetles. Study daily to become familiar 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’ Bul. 679.) 
Mount specimens of insects studied this month. (See Farmers’ 
Bul. 606.) 
Correlations.—Language lesson material is abundant. Describing 
the toad, its habits and means of livelihood and recording observa- 
tions wut 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. 
