468 NATURE-STUDY 



emphasized. Simple elementary science is introduced under 

 the head of inventions or discoveries, explanations being 

 sought for them through experimentation. Causal relations, 

 generalizations of principles from observations, comparisons 

 and wider classifications can now be made. But do not 

 make too scientific. Correlation with geography, manual- 

 training, domestic economy, etc., should continue. In this 

 grade it might be advisable in more rural situations to spe- 

 cialize the nature-study along the lines of elementary agri- 

 culture. 



Suggestions for correlated art lessons see p. 57. The asterisk indicates 

 subjects for drawings, diagrams, painting, etc. The numbers refer to gen- 

 eral reference list, p. 521. 



THROUGHOUT THE YEAR 



EARTH STUDY: Review briefly common minerals. Add 

 to the mineral collection crystals of minerals and crystalline 

 rocks of igneous origin. Make a simple study of volcanic 

 rocks. Economic study of granite, lime-stone, sand-stone, 

 and marble. (343, 347, 339, 336.) 



Gold, silver, copper, their ores, mining, simple explanation 

 of purification, uses. Stories of gold-miners. The silver- 

 smith. The U. S. Mint. (336, 339, 343, 320, 262, etc., 

 geographies, magazines.) 



Soil-water: Wells and springs. Source. Conditions. 

 Minerals in solution. "Fur" in tea-kettle. Mineral waters. 

 Alkali soil and water. Relation to drinking and agriculture. 

 (326, 327, 328, 262, 263, etc.; 222, 241, etc.) 



Visit to boulder field, morainic deposits. Compare rocks 

 and soil with bed rock of vicinity. Origin of these rocks 

 and soil? Find scratched glacial pebbles.* Simple talk 



