211 



Cape geological system, 163, 171. 

 Carbonic acid as a plant food solvent in the soil, 5. 

 Carlton, 89. 



Carnarvon Division, 45, 185. 

 Caroxylon salsola : see " Ganna." 

 Cathcart Division, 19, 21, 46-50, 74. 



Cattle diseases and deficiency of phosphates, 3, 23, 64, 102. 

 Cereals and phosphates, 45, 47, 72, 114. 

 Ceres Division, 20, 21, 50, 52, 164. 

 Chemical analysis of soil, its value, 2, 8, 11. 

 methods of, 2. 



,, complete, purpose served by, 2. 



,, index of fertility, 2. 



and mechanical composition of soil, relation between, 188. 

 decomposition distinguished from mechanical disintegration in the produc 



tion of plant food, 10, 80, 124, 159, 163. 

 Chlorine, determination of, in soil, 8, 175. 

 Chumie : see Tyumie. 

 Citric acid for soil extraction, 2, 9, 10, 12, 13. 



method of soil extraction, 16, 17, 155, 156. 

 Clanwilliam Division, 20, 21, 51, 155. 

 Classification of soils on basis of plant food percentages, 17. 



mechanical condition, 188-190. 



Clay, application of the term, 192, 195. 



carried down to subsoil by rain, 172, 192. 



in mechanical analysis, definition of, 192. 



Orange River, 108, 203. 



richest of soil grades in plant food, 13, 24, 192. 



soil, American heavy, analysis of, 10. 



soils, physical composition of, 188. 



Vergennes, 203. 



,, mechanical analysis of, 203. 

 Coarse sand, application of term, 193. 

 Cofimvaba, 121. 



Colesberg and Steynsburg soils compared, 128. 

 Colesberg Division, 20, 21, 52, 63, 128, 155, 169, 177. 

 Collection of samples, 6, 173, 186. 



Comparison of soil extraction methods, 59, 63, 94, 119, 120, 126, 153. 

 Constantia loams, 42. 

 Coo, The, 116. 



Corn (i.e., Indian corn) soils, physical composition of, 190, 192. 

 Corstorphine, Dr. G. S., 166. 

 Cossa, Professor, 2. 

 Cretaceous System, 169, 171. 



Cultivation without manuring, habit of, 25, 28, 50, 82, 83, 84, 85, 113, 143. 

 Culture experiments, 5. 

 Cylinder for sedimentation, 194. 



Decomposition, chemical, and mechanical disintegration, 10, 80, 124, 159, 163. 

 Definitions of soil grades, 7, 12. 



Clay, 195. 



Coarse gravel, 194. 

 sand, 193. 



Earth, 194. 



Field sample, 7. 



Fine earth, 7, 194, 195. 

 ,, gravel, 194. 

 sand, 194. 

 silt, 195. 



Gravel, 193. 



Medium sand, 194. 



Silt, 195. 



True soil, 7, 193. 



Very fine sand, 195. 

 Deterioration of irrigated lands, 186, 

 Diabase, 163. 

 Diep River, 38, 41. 

 Digby, 1. 

 Disintegration and decomposition, 10, 80, 124, 159, 163. 



