A GRADED COURSE OF NATURE-STUDY 479 



fishes,* their habits, habitats, and food value. Special 

 adaptation to food or mode of life. Primitive and modern 

 methods of fishing,* including sea-fisheries. Connect study 

 of fisheries with geography. Principal kinds of salt-water 

 fish: Cod, herring, mackerel, also refer to sharks and 

 flying fish. 



Fresh-water: Bullhead, sucker, minnow, carp, salmon, 

 (The Story of the Salmon in 468), trout, pickerel, eel, sunfish, 

 bass, perch, stickleback. (42, 49, 46, 41, 313, 320, 322, 323.) 

 Visit fish markets. Note methods of preservation. Keep 

 live fish in an aquarium, and make studies upon their habits. 

 Discuss the breathing of a fish. Examine the gills of a dead 

 fish. Why must the water be changed if many fish are in 

 a vessel and there are no water plants ? A fish can drown in 

 water that has been boiled and cooled. Why? (33, 34, 42.) 



Read sections from the game laws pertaining to fishing. 

 Why such laws? 



Encourage obedience to these laws. Discuss the artificial 

 hatching of fish, and the stocking of lakes and streams with 

 them. (21, 42, magazines, and the volumes of the United 

 States Fish Commission reports.) 



Plants. 



- General: Simple lessons in plant growth,* illustrated 

 experimentally on seedlings and plants in window-boxes or 

 greenhouse. Review the work of the root. Show by ex- 

 periment absorption from soil. Observe sap in stem. Ob- 

 serve maple-sap and the "bleeding" of trees and vines in 

 spring. Show transpiration from leaves. Grow plants in 

 dark to show relation between light and leaf-green. Do 

 the simple iodine test on a leaf to show the presence of 



