XIV 



CONTENTS 



258 ; "Value of legumes, 259 ; Value of rain and snow, 

 260 ; Nitrogen, 261 ; Phosphorus, 262 ; Potassium, 263 ; 

 Wood ashes, 264 ; Nitrogenous fertilizers, 265 ; Signs of 

 lack of food, 266 ; Crop rotation, 267 ; A growing crop, 

 268 ; Manures, 269. 



CHAPTER XII 



Plants as Affected bt Animal Parasites 



Classes of parasites, 270; Mice, 271; Gophers, 272; 

 Rabbits, 273; Woodohuoks, 274; Birds, 275; Useful 

 insects, 276 ; Preventive methods, 277 ; Inclosing the 

 plants, 278 ; Trapping, 279 ; Repelling insects, 280 ; 

 Hand picking, 281 ; Poisoning, 282 ; The arsenic com- 

 pounds, 283 ; Paris green, 284 ; Arsenite of lime, 285 ; 

 Arsenate of lead, 286 ; Other arsenites, 287 ; Poisons, 

 288 ; Hellebore powder, 289 ; Pyrethrum powder, 290 ; 

 Keeping these powders, 291 ; Tobacco smoke, 292 ; To- 

 bacco solutions, 293 ; Kerosene, 294 ; Lime sulfur wash, 

 295 ; Resin (or rosin) washes, 296 ; Hydrocyanic acid 

 gas, 297 ; Pir-tree oil, 298 ; Hot water, 299 ; Number 

 of insects, 300 ; The chinoh-bug, 301 ; The army-worm, 

 302 ; Grasshoppers and locusts, 303 ; Apparatus for ap- 

 plying insecticides, 304 ; The use of insecticides, 305 ; 

 Classes of insects, 306 ; The eating insects, 307 ; The 

 leaf-eaters, 308 ; The root-eaters, 309 ; Burrowers, 310 ; 

 Borers, 311 ; Leaf-miners, 312 ; The oodlin-moth, 313 ; 

 The plum curculio, 314 ; Destroying fruit, 315 ; Sucking 

 insects, 316; The life histories, 317. 



152-172 



CHAPTER XIII 



Plants as Affected bt Vegetable Parasites and by 



Weeds 



Types of vegetable parasites, 318 ; The broom rape, 

 319 ; The dodders, 320 ; Parasites of the lower orders, 

 spore plants, 321 ; Methods of controlling plant diseases, 

 322 ; Destruction of the affected parts, 323 ; Infection 

 may be prevented, 324 ; Soil treatment, 325 ; Soil ster- 



173-185 



