Lessons Involving Comparison 125 Cat and dog; experiments for assisting in the study of the cat; comparison of the horse and cow 126 The Squirrel 129 Field exercises; class-room lesson 129 Winter Birds 130 Field exercises; class-room lesson; correlations 130 Animals of the Zoological Gardens 132 CHAPTER VIII. FORM II: SPRING Garden Work 133 Combating Garden Pests 134 Cutworms; root-maggots; flea-beetles 134 Seed Germination 135 Plants for Individual Plots 137 Studies Based on Observations of Growing Plants 137 Planting and care of sweet-peas 138 Wild Flowers 139 Weeds 140 The Apple Tree 141 Field exercise; class-room lesson; field exercise following class-room lesson 141 Bird Study 143 The Toad 143 Field exercises; class-room lesson; detailed study; life history of the toad 143 The Earthworm 147 Class-room lesson; references 148 The Aquarium 149 Aquarium Specimens 150 Mosquito; study of adult form; the development; references 150 Caddice-fly 152 Insects Suitable for Lessons in Form II 153 CHAPTER IX. FORM III: AUTUMN Garden Work 154 Treatment of Fungi 154 Treatment of Insects--cabbage-worm 156 Plants 158 Annuals, Biennials, and Perennials 158 Class-room lesson 158 Garden Studies 159 Annuals, biennials, perennials 159 Special Study of Garden Plants 160 Sweet-pea; pumpkin; corn; correlations 160