VI CONTENTS 



CHAPTER PAGB 



XIX. — Life in Water 197 



XX. — Rural School Gardening .... 203 

 XXI. — Suggestions for Conducting Work in 



the Seventh and Eighth Grades . 207 

 XXII. — Pollination and Seed Forming . .210 



XXIII. — Plant Breeding 214 



XXIV. — Insects 217 



XXV. — Fungi and Bacteria 224 



XXVI. — Selecting, Judging, and Storing Seed 



Corn 231 



XXVII. — Physical Experiments 235 



XXVIII. — Some Effects of Heat on Bodies . . 241 



XXIX. — Methods of Heating Bodies . . . 244 



XXX. — Germination of Seeds .... 249 



XXXI. — Study of Oats 255 



XXXII. — Plant Products 259 



XXXIII. — Simple Experiments in Soil Chemistry . 264 



XXXIV.— Soil and its Origin 277 



XXXV. — Some Physical Properties and Condi- 

 tions of Soil 280 



XXXVI. — How Plants Do their Work . . . 288 

 XXXVII. — How to Keep the Soil in Condition to 



Supply the Needs of Plants . . 299 



PART FOUR 



XXXVIII.— Bird Study 

 XXXIX. — School Gardens .... 



XL. — Some Fundamental Misconceptions 

 XLI. — The General Life Processes 

 XLII. — Explanations of Evolution 

 XLIII. — Evolution as Shown by Plants 



Index 



3°3 

 314 

 320 

 324 

 33i 

 339 



35i 



