CONTENTS. xiii 



Page 



Composition of Animal Manures . . . 175 



The essential Elements of Manure . . .179 



Bone Manure . . . . . . 185 



Manure supplies Nitrogen . . . .189 



Mode of applying Urine . . . . 193 



Value of human Excrements . . . .197 



Concluding Remarks . . . . . 201 



APPENDIX TO PART I. 



Growth of Plants without Mould . . 204 



On the Action of Charcoal on Vegetation . . -207 



On the Rotation of Crops at Bingen, on the Rhine . 211 



On a mode of manuring Vines . . 211 



PART II. 



THE CHEMICAL PROCESSES OF FERMENTATION, DECAY, 

 AND PUTREFACTION. 



Chemical Transformations . . . .217 



Their Cause . . . . . . . 220 



Chemical Transformations of Organic Compounds . 231 



Transformations of Bodies containing Nitrogen . . 240 

 Fermentation of Sugar ..... 248 



Yeast or Ferment, . . . . . . 251 



Nature of Fermentation . . . . .257 



i8 9 or Decay . . . 260 



