454 NATURE-STUDY 



Limestone and marble: Connect with the last. Origin, 

 nature. Test with acid. Uses of limestone. Show spec- 

 imens with fossil coral. What other creatures help to make 

 limestone? (324, 326, 327, 317, 318, 339, 343.) 



Marble: Test with acid. Relation to limestone. Crys- 

 talline. Visit a marble-cutter's shop. Observe varieties of 

 marble. Make a collection, polish. Uses of limestone 

 refer also to sculpture. (324, 326, 327, 318, 317, 339, 343.) 



WEATHER: Rainfall record. Relation of plants to rain- 

 fall. (327, 326, 328, 158, 156, geographies.) Typical 

 climatic regions in the United States, chiefly in the geography. 

 (327, 328, etc.) Cause of winds (see physics below). (251, 

 257, 326.) Relation between the wind and the weather- 

 simple. (327, 326, 328, etc.) Effects of frost on vegeta- 

 tion and animals. (Winter state of plants, hibernation, and 

 migration of animals.) (156, 152, 158, 33, 34, 17.) Frost 

 effects on water in air, on soil, on rocks. (327, 326, 328, 

 etc.) 



PHYSICS: Three forms of matter illustrated by experi- 

 ments on water, etc. Distillation, evaporation, condensa- 

 tion. Experiments * and applications. Conduction of heat 

 experiments,* applications. Convection of air.* 



Apply to, heating, ventilation, land and sea winds. (These 

 lessons must be illustrated by experiments see Chapter V. 

 Be sure to make the application.) (251, 250, 259, 257, 340, 



449> 3 l8 -) 



Inventions: Observe men at work with tools. Visit a 

 factory, and note machinery. Visit a place where derricks, 

 etc., are used for moving heavy weights. Compare primitive 

 man with the present in regard to tools, machines, and 

 other inventions. Refer to the conveniences and advantages 



