3 86 



INDEX 



Page 

 Cross section or contour survey. . 174 



Crowns and side ditches 321 



Crushed rock for macadam roads 330 

 Cultivation, accelerates soil aera- 

 tion . 70 



irrigated fields require special 271 



Culvert, concrete 301 



Culverts 300, 30 1 



Datum plane 185 



Dead furrows 183 



Department of Agriculture, bul- 

 letin on measurement of 



irrigation water 258 



Department of Agriculture, Bu- 

 reau of Spils 93 



taking part in drainage 232 



Office of Public Roads, 



281, 334, 353 



reports of drainage 232 



Depth of drains 197 



Devices, grading 205 



Dikes, co-operative care of 2 



pumps and gates 228 



Dirt mulch, value 51, 85 



Ditchers, capstan plow 216 



Ditches 163 



field 259 



opening with machinery .... 212 



roadside 180 



side 321 



Ditch, filling 210 



grading bottom of 202 



laying tiles in 206 



surveying line of 184 



water from, taking onto land 262 



Ditching machinery 212 



plow ". 220 



Drag, log 344 



or slush scraper 317 



Drainage 140 



accelerates aeration of soil. . 70 

 agricultural colleges dealing 



with 232 



benefits 149 



education 232 



effect on soil shown in vari- 

 ous ways 150 



Government taking active 



part in 232 



land needing 141 



legislation 146, 153 



localities especially needing. 145 

 need, how to determine 



141, 145, 147, 148 



not needing 148 



plats 162 



relation of rainfall 148 



reports of Department of 



Agriculture on ........ 232 



sewers 225 



surface 179 



Drain, clay as material for mak- 

 ing 166 



cost of 168 



entrance of water into 170 



injury by freezing 152 



Page 



Drain, laying in ditch 206 



price list of 169 



quality of 169 



size of. 196 



tile factories 168 



tiles 166 



Draining roadbed 307 



Drains, branches of 193 



construction of tile 200 



depth to make 197 



making open 216 



obstructions in 231 



opening, with spade 200 



private 155 



section of land with 177 



slope or grade of 194 



stone and board 227 



surface 177 



making a plan for 181 



tile, construction of 200 



cost of laying 215 



mapping out 174 



survey for construction . 172 



vertical and special 221 



Drift, glacial 38 



Drouth, endurance by soil 90 



Durability, roads, points in 305 



Dust blanket 51, 85 



jacket in stone crusher 338 



Earth, economical handling of . . . 313 

 general movement of water 



in 85 



geological history of 32 



roads, common 322 



Earth, surfaces, spreading and 



compacting 327 



water, movements in 85 



Earthworms, benefit to soil 68 



Education, drainage 232 



for country life 5 



institutions devoted to. 7 



good roads 353 



in agriculture; technical. ... 3 

 Eldridge, Maurice O., notes on 



cost-data 291 



Electricity, relations of to agri- 

 culture 27 



Elements required for growth of 



plants 62 



Elevating grader 220, 317 



Elevator machinery for water. . . 247 

 Entomology, relations of to agri- 

 culture 29 



Excavating cuts and building 



grades 319 



Explosives, nature and use 124 



Falls of St. Anthony, history of . . 44 



the recession of 47 



Farm, business organization of 



the 96 



general foundation plans for 



the 96 



healthfulness of 90 



producing capacity of 90 



home, racially most impor- 15 

 tant selection of a 89 



