232 Index. 



Constant use of land, 87. 



Control of weeds, 31. 



Copper sulphate, use in spraying, 158. 



Corn cockle, description of, 214; eradication of, 

 217. 



Cost of weed eradication, 28; in pastures, 123. 



Cost of crop production^ increased by weeds, 37. 



Cost of maintaining clean fields, 33, 101. 



Couch grass, 176. 



Creeping perennials, 66. 



Cultivation, autumn, as method of eradication. 90. 



Cultivated crops as means of eradication, 78. 



Daisy, ox-ey^, eradication of, 127. 



Darnel, eradication of, 187. 



Distribution of weeds, 40; by animals, 43, 51; by 

 birds, 50; by clover seed, 41; control of 

 agencies of, 55; by farm animals, 43; by 

 farm implements, 48; by feed-stuffs, 44; by 

 floods, 51; by grain, 41; by grain screen- 

 ings, 77; by grass seed, 41; by live stock, 

 43; by manure, 45; by packing material^ 46; 

 by railways, 50; by root-stocks, 54; by 

 thrashing machines, 49; by tillage, 48; by 

 vehicles, 47; by water, 51; by wild animals, 

 51; by winds, 52. 



Dropseed gras^ 179. 



Eradication of weeds, 58; abundant crop pro- 

 duction an aid in, 88; use of alfalfa in, SO; 

 use of annual pasture crops in, 93; by au- 

 tumn cultivation, 90; by use of bare fallow, 

 107; by use of clean seed, 74; by use of 

 clover, 80; by constant use of land, 87: cost 

 of, 26, 29, 122; by use of cultivated crops, 

 78; by destruction of screenings and chaff, 

 77; by home production of feeds, 85; by 

 modifying rotation, 71; necessity for 

 thorough work in, 95; possibility of, 21; by 

 prevention of seeding, 91; by pasturing with 



