FALL AND WINTER ANIMAL STUDY. 429 



gathering them, the children may learn considerable about 

 their habits. 



Keep in glass fruit jars or tumblers, covered with net- 

 ting, or better, in a box with at least two sides made of 

 wire netting, to allow circulation of air. If kept in box, 

 place in bottom of box a vessel filled to a depth of three 

 or four inches with moist, not wet, soil or moss. Sub-soil, 

 which contains fewer disease-producing germs, or moss 

 thoroughly boiled to kill the germs, is best. 



Fig. 41. Polyphemus Cocoon. 



Keep a supply of fresh food, milkweed leaves for the 

 milkweed caterpillar; cabbage or some other cruciferous 

 plant for the cabbage worm ; maple, burdock, or plaintain 

 leaves for the others. In general, every species should be 

 supplied with the plant on which it was found feeding. 

 Try to keep cages and food fresh and clean. 



THE MILKWEED, OB DANAIS CATERPILLAR. 



Preliminary Observations. Encourage and help children 

 to watch them out-of-doors and at home. Keep in the 

 schoolroom several days before formal work, and give 

 children opportunities to observe their habits. Give one 



