INDEX 



421 



moderate grazing and timber pro- 

 duction on, (fig.) 19; on cattle 

 range moderately grazed, (fig.) 24; 

 forage on, 198; damage to, by graz- 

 ing, 199; tree severely browsed by 

 sheep, (fig.) 201; effect of grazing 

 on reproduction in Arizona and 

 New Mexico, 202; injury by cattle 

 browsing, (fig.) 203; study of graz- 

 ing damage on Coconino National 

 Forest, 204; effect of goat grazing 

 on, 210; used for troughs, 300. 



Yellow pine-oak, natural-type unit, 

 study of, in grazing course, 385. 



Yellowstone Park Reserve, first For- 

 est Reserve created, 17. 



Zones, of vegetation surrounding bed 

 ground 119, (fig.) 120; Transi- 



tion, Canadian, and Hudsonian, 

 study of, in grazing course, 385. 



Zoology, auxiliary subject in study of 

 pasture management, 361; appli- 

 cation of, 362. 



Zygadenus, species of poisonous plants, 

 242; description, 261; distribution 

 and habitat, 261; losses due to, 262; 

 poisonous parts, 262; amount re- 

 quired to cause death. 263; symp- 

 toms of poisoning, 263; remedies, 

 263; characteristic sheep poisoning, 

 (fig.) 264; for study in grazing 

 course, 370. 



Zygadenus elegans, poisonous species, 

 261, (fig. frontis.). 



Zygadenus gramineus, poisonous species, 

 261. 



Zygadenus paniculatus, poisonous spe- 

 cies, 261. 



Zygadenus venenosus, poisonous spe- 

 cies, 261. 



