Pupa.—Observe the larvæ disappear from the plants; a search underground reveals the resting stage, or pupæ. After ten days, the adult beetles emerge.
Adult.—Observe the colour, the hard shell covering the head; the hard outer wings and membraneous inner wings; the hard shell on the under surface of the body; the feelers, and legs.
Why will spraying with a poison, such as paris-green, kill these insects?
REFERENCES
Dearness: How to Teach the Nature Study Course Stories in Agriculture, Bulletin No. 124.
FISH
The Nature Study lessons must be based upon observations of the living fish, preferably in May or June, September or October. The best place for this is on the bank of a clear stream from which it is possible to observe the fish in their natural environment. Here their life activities, their struggles, their conquests, and silent tragedies are enacted before the eyes of the observer. Many observations may be made in this way which will create a life-long interest in these reticent, yet active creatures. Since this method of study is practicable in but few cases, the study of the living fish in the aquarium is the best available substitute.
The teacher or the boys of the class can catch a few fish of three or four inches in length and carry them in a jar of water to the aquarium. Minnows, chub, perch, catfish, or other common forms will do.