-* 
CONTENTS. 1X 
CHAPTER .V i. 
THE Som AS A SOURCE OF Foop To Crops: INGREDIENTS WHOSE ELEMENTS 
§ 1. 
§ 2. 
§ 3. 
§ 4. 
§ 5. 
§ 6. 
ARE DERIVED FROM ROCKs. 
General View of the Constitution of the Soil as Related to Vegetable 
Loc? ek pe 5 ge 2 a (a ae Sh cinta ae 305 
REE MOM OF Uiaineel 2.6282 eee ler a 309 
SSO alyee SOU 1) StLLOUO AGIOS... 25.05 so cc seek. cead Deck ce B29 
Penton Offs ON COSOlI DIG IE eACIISN So iletacee a. . weiss Sosealeeecweene a. 330 
Reactions by which the Solubility of the Elements of the Soil {fs al- 
tered. Solvent Effects of Various Substances. Absorptive and 
Hide OVET IO SOUS ye a0 <r) oer eek eolkcldts ots stds SMe ete Se oe ee 331 
Beyiew ani Conclusion... <6 426 fees ss es Sans Aaa eon dal tice eemp.are ees 361 
