312 INDEX. 



PAGE 



"boos" 161 



breathing 8 



breezes. See wind. 



broom-rape 104 



burning. See combustion. 



calcium as plant food 27 



chloride in soil 32-34 



cyanamide 294 



in Nile mud 24, 228 



in soils 24, 29, 31 



canals 150, 153, 159 



capacity. See water capacity. 



capillarity . . 48, 52-58, 72, 98 



carbon dioxide as plant food 9 



exhaled by animals and plants 9 



in air 7, 8 



in soil 24, 43 



carbonate of soda 89 



carbonic acid. See carbon dioxide. 



chemical properties of soils , 27 



chlorine in Nile mud . . 24 



in soils 24 



chloride of potash 306 



of soda. See sodium. 



clay soil 25 



shrinkage of 49 



properties of 79 



cleaning crops 92 



climate, in relation to agriculture 11-19 



clouds, formation of 15 



coagulation 40, 50 



colloid matter in soil 39, 48, 49 



colmatage. See warping. 



colour of soils t> 80 



combustion 8, 9 



composition of atmosphere 7 



Nile mud 24 



soil 24 



cotton 82, 83, 95, 103, 107, 152, 154, 157 



sowing of t 106 



" coufri " manure 77, 82, 257-265 



cracking of soil. See shrinkage. 



crops 164 



cultivation of soil 21, 75-108 



cultivators (implement) 96, 97, 107, 119-120 



