xvi CONTENTS 



CHAPTER XIV 

 THE RECENT WORK ON THE BIOCHEMICAL PROCESSES OF THE SOIL 



MM 



I. Soil Protozoa . . . . . . .273 



II. Sick Soils ........ 282 



III. Biochemical Reaction ...... 283 



References . . . . . , . .285 



CHAPTER XV 



SECONDARY ACTIONS OF ARTIFICIAL MANURES UPON THE SOIL 



I. Loss of Calcium Carbonate ...... 289 



II. Soil Acidity ........ 291 



III. Nitrate of Soda and Tilth . . . . . .297 



IV. Action of the Plant on the Soil . . . . .301 

 V. Final Considerations ...... 309 



Reference .... 310 



APPENDIX 



List of Publications issued from the Rothamsted Experimental Station, 



1843-1905 311 



Publications by other Investigators, dealing with Material from 



Rothamsted ....... 322 



Other Publications dealing with the Rothamsted Experiments 324 



INDEX ... . 327 



