Chapter 10

Care of Plants in the Home 178 Plant Cuttings 179 Selection of cuttings; potting of rooted cuttings 179

Evergreens--class-room lesson 181

Collection of Wood Specimens 182

Related Reading 183

How Animals Prepare for Winter 183 Summary of Lessons; correlations 184

Chickens 185 Conversation lesson; arithmetic lesson; care and food of chickens 185

Physical Science Phase of Nature Study 188

Solids, Liquids, and Gases 188 Change of State 189 Expansion of Solids 189 Practical applications; questions for further investigation 190 Expansion of Liquids--applications 192 The Thermometer 193 Expansion of Air 194 Sources of Heat and Light 194 Notes for a Series of Lessons 194 Conduction--problems 196 Convection--problems, convection in gases; applications 198 Radiation of Heat--problems 199