INDEX 



409 



control of, in India, 26; dependence 

 of agriculture on, 26; reseeding ex- 

 periments on, 43; burned-over for- 

 est range, (fig.) 46; relation to irri- 

 gation, 172; liability of fires, 232; 

 grazing reconnaissance on, 309; 

 acreage required per cow unit, 331; 

 acreage required for sheep, :iis'7 

 water supply ample on ranges of, 

 355; creation of, for study in grazing 

 course, 365, 366; function and re- 

 sults of, in regulating grazing, for 

 study in grazing course, 366; in- 

 vestigations on, for study in grazing 

 course, 376. 

 Needle-and-thread, injurious species, 



288; description, 288. 

 Needlegrass, in Great Plains, 6; me- 

 chanically injurious, 286, 288; for 

 study in grazing course, 368. 

 Needlegrass, small, on eroded and 



noneroded pasture, 118. 

 Neopieris mariana, poisonous species, 



274. 

 New Genesee Farmer, introduced Al- 



sike clover, 152. 

 New Mexico, cattle and sheep grazed 

 under permit, 21; study of effect of 

 grazing on timber reproduction, 202; 

 overgrazing and trampling near 

 watering place, (fig.) 297; studies 

 of grazing capacity, 329; investi- 

 gations in, for study in grazing 

 course, 376. 

 Nevada, cattle and sheep grazed under 



permit, 21. 

 Nitrifying bacteria, destroyed by fire, 



226. 

 Nitrogen, essential part of diet, 3; 

 ingredient of fertilizer, 99; in eroded 

 and in noneroded soil, 184; percent- 

 age returned to soil in manure, 222. 

 Nitrogenous materials, in the diet, 3; 

 in the soil, caused by decomposition 

 of vegetation, 221. 

 Northern Pacific Railroad Company, 

 land grants to, 30; leases, 31; leas- 

 ing system, for study in grazing 

 course, 366. 

 Northwest, the, pasture lands, for 

 study in grazing course, 365; in- 

 vestigations in, for study in grazing 

 course, 376. 



Oak, po'sonous to stock, 273. 

 Oak, Gambel, poisonous species, 273. 

 Oak, scrub, in desert range of Great 

 Basin, 7. 



Oak, shinnery, poisonous species, 273. 



Oakley, R. A., investigation of methods 



of cropping and treating pasture, 93. 



Oatgrass, for study in grazing course, 



368. 

 Oatgrass, tall meadow, in reseeding 

 test, 44; amount to sow and cost, 

 5S; moisture requirements, 54; for 

 hay and pasture combined, 132; 

 habit of growth, (fig.) 146; value, 

 146. 

 Oats, wild, semi-domesticated, 55; 



on winter ranges, 80. 

 Oestrus ovis, in sheep, 276. 

 Ohio River, floods, 174. 

 Old maid's-bonnet, name for lupine, 



266. 

 Onagraceae, for study in grazing course, 



369- 

 Onion, annual plant, 324. 

 Oniongrass, indicator plant, 129. 

 Oniongrass, showy, indicator plant, 



129. 

 Orchardgrass, in reseeding tests, 41, 

 44, 45, 47; amount to sow and cost, 

 Sy, moisture requirements, 54; on 

 permanent pasture, 88; habit of 

 growth, 90; for hay and pasture 

 combined, 132; habit of growth, 

 (fig.) 142; mixture for permanent 

 pasture, 148, 149. 

 Oregon, cattle and sheep grazed under 

 permit, 21; study of effect of graz- 

 ing on timber reproduction, 199; 

 investigations in, for study in graz- 

 ing course, 376. 

 Orthocarpus, Tohnie's, in first or early 

 weed stage, 115, (fig.) 116; indicator 

 plant, 128. 

 Orthocarpus Tolmiei, in first or early 

 weed stage, 115, (fig.) 116; indicator 

 plant, 128. 

 Oryzopsis, for study in grazing course, 



368. 

 Overgrazing, cause and effect, 10; 

 area protected for five years, (fig.) 

 11; carrying capacity of pasture, 12; 

 denuded summer range, (fig.) 13; 

 cost of, 61; cause of depletion of 

 bunchgrass lands, 95; on nonsod 

 pastures, 96; how to recognize and 

 correct, 104; conspicuous signs of, 

 106; indicators of moderate, 107; 

 relation to erosion, 173; on Manti 

 Forest, 174; erosion due to, (fig.) 

 183; overgrazing and erosion, (fig.) 

 190; avoidance of, to prevent 

 erosion, 191; damage to tree re- 

 production by, 235; cause of soil 

 depletion, 235; cause of loss by poi- 



