INDEX 



249 



Corn, soils, 28, 29, 30, 161. 



structure of seed, 78. 



water used by, 40. 

 Corolla, 129. 



function of, 132. 

 Cotton, 5, 161. 



a humus waster, 221. 



in rotation, 225-229. 



plant, 6. 



plant food removed by, 

 227. 



Sea Island, 161. 



soils, 28, 29, 161. 



upland, 161. 

 Cotton hull ashes, 199. 

 Cotton-seed meal, 194. 

 Cotyledons, 77. 



use of, 79. 



Coulter of plow, 94. 

 Coulter-toothed harrow, 102, 



104. 

 Cow manure, 178. 



losses by exposure, 178. 

 Cowpeas, 68, 186. 



for green manuring, 186. 



plant food in, 187. 



root growth of, 12. 



soils for, 187. 

 Cropping and soil water, 



159, 160. 

 Crops, cleansing, 232. 



feeding, 232. 



in rotation, 219. 



manurial, 232. 



money, 232. 

 Cucumber flower, 133. 

 Cultivation. 



(See After-cultivation.) 



Denitrification, 147. 



conditions favoring, 147. 

 Denitrifying germs, 144, 147. 

 Draft ring of plow, 93. 

 Draining, need of, 235. 

 Drains, 158-239. 



and capillary water, 237. 



covered, 237. 



Drains, effect on film water 



237- 



effect on plant food, 238. 

 effect on soil temperature. 



238. 



effect on soil water, 237. 

 grade of, 239. 

 lateral, 239. 

 location of, 238. 

 main, 239. 

 open ditch, 237. 

 surface, 237. 

 tile, 239. 



Dried blood, 194. 

 as a fertilizer, 194. 

 nitrogen in, 194. 



Early crops, soils for, 27, 28. 

 Egg experiments to show 



osmose, 18, 19. 

 Egg plant, soil for, 28. 

 Elements in plants, 66. 

 Elm tree leaf beetle, 117. 

 Endosperm, 78. 



use of, 79. 

 Epicotyl, 78. 

 Essential organs of flowers, 



131- 



Evaporation, loss of water 

 by, 54- 



loss of heat by, 59. 

 Excursion, 



to examine soils, 24. 



to see plow cutting roots, 



14- 



to study roots, n. 

 to study leaves, 108. 

 to study steins, 120. 

 to visit farm, 4. 

 Experiment to show, 

 air necessary for germina- 

 tion, 73. 

 amount of transpiration, 



1 10. 



capillarity, 49. 

 capacity of soils for film 

 water, 51. 



