Exercises on Lesson X.
1. Procure some “water boatmen” from the nearest pond (see [Appendix]), feed them upon flies, and watch their habits. Notice particularly their method of swimming and of feeding. 2. We should not keep all our pond animals in one tank. Can you explain (giving examples) why this is? 3. Write the life-history of the diving beetle. 4. Make large sketches of the diving beetle and its larva. Compare them.
Water Beetles. Hog Lice. Water Whelks. Water Boatman.