A GRADED COURSE OF NATURE-STUDY 487 



cause, wind direction, general path over United States. 

 Prediction of a progressing cyclonic storm. Follow the 

 daily weather bulletins on map, and note the progress of the 

 storm. Observe the wind and the barometer, and also the 

 cloudiness, etc., before, during, and after the storm. What 

 the weather maps tell. How predictions are made. De- 

 scription of the United States Weather Bureau, its work 

 and methods, its value to sailors, farmers, and others. Use 

 of the thermometer, barometer, hygrometer, rain-gauge, 

 weather maps. Keep a record of the weather with these 

 instruments for a number of weeks in different seasons. 

 Study the record and make out relations between the weather 

 and the wind, pressure and temperature. (Apply in geog- 

 raphy. Art-studies of landscapes.) 



References: Physics: 251, 259, 250, 254, 257, 258, 247, 

 248, 449, 450. 



Physical Geography and Meteorology: 327, 328, 326, 338, 

 334, 340, 33'^, 345, 34i, 449- See also geographies. 



Chemistry: Of the kitchen: Acid (vinegar, lemon, 

 muriatic acid). Alkali (lye, soap, soda, borax). Oil and 

 fat. Make soap. Common salt, baking-powder, soda, and 

 cream of tartar. Neutralizing acids or alkali. Examine and 

 test in the laboratory the properties of each. Discuss the 

 household use and the properties utilized. Make simple and 

 practical. Chemistry of bread. References, Chemistries: 

 263, 264, 269, 266. Cooking and cleaning: 262, 268, 274. 



Fuels and illuminants: Review combustion of carbon. 

 Review oxygen. (263, 264, 269, 262.) 



Iron : Smelting and reducing of iron ore. Visit smelter if 

 near one. Simple experimental illustration (red lead on char- 

 coal before blowpipe). Visit a foundry. Observe casting. 



