160
Sweet-pea; pumpkin; corn; correlations 160

Seed Dispersal--Lesson 164
Detailed Study of Seed Dispersal--class-room lesson 165
Seed collections; man as a disperser of seeds 166

The Sugar Maple--field exercises 168
Maple Leaves--class-room lesson; correlations 169

Weed Studies 170
Observation lesson on weed seeds 171

Grasshopper--field exercises; class-room lesson 172

Aphides 174

Tomato Worm--the adult; the chrysalis 175

The Crow; correlations 177

CHAPTER X. FORM III: WINTER

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, convectio