CONTENTS Xlll 



PAGES 



212 ; Localities subject to frosts, 213 ; Thermal belts, 214 ; 

 Liability to frost, 215 ; Methods of preventing injury by 

 frost, 216. 



CHAPTER IX 

 THE PLANT AS AFFECTED BY WATER 129-136 



Destruction of roots, 217 ; Injudicious watering, 218; 

 Watering, 219; Rapidly-growing plants, 220; Water 

 requirement of plants, 221 ; Dropsical condition, 222 ; 

 Water sprouts, 223 ; Cracking, 224 ; Knobby potatoes, 

 225 ; Air moisture, 226. The plant as affected by insuf- 

 ficient water: Excessive transpiration, 227; Retarding 

 growth, 228 ; Hastening maturity, 229 ; Toughness of 

 plant tissues, 230 ; Cultivation of the soil, 231 ; Mulch- 

 ing, 232 ; Irrigation, 233 ; Drying, 234. 



CHAPTER X 



THE PLANT AS AFFECTED BY UNFAVORABLE LIGHT AND 



WIND 137-143 



Excessive light : Shading plants, 235 ; Cauliflower 

 heads, 236. Plants as affected by insufficient light: 

 Abnormal development, 237 ; Close planting, 238 ; 

 Weeds, 239 ; Plants under glass, 240 ; The electric 

 light, 241 ; Insufficient pruning, 242 ; Blanching, 243. 

 Plants as affected by excessive wind : Preventive meas- 

 ures, 244. Plants as affected by insufficient wind : Fun- 

 gous attacks, 246 ; Frost damage, 246 ; Pollination, 247. 



CHAPTER XI 

 THE PLANT AS AFFECTED BY UNFAVORABLE FOOD SUPPLY 144-151 



Excessive food : Excess of most foods, 248 ; Excessive 

 nitrogen, 249. Plants as affected by insufficient food : 

 Lack of food and water, 250 ; Dwarfing of plants, 251 ; 

 Reducing plant-food, 252 ; Deficient food elements, 25b ; 

 Importance of nitrogen, 254 ; The sources of nitrates, 

 P55 ; The conditions affecting nitrification, 256 ; Soil 

 aeration, 257 ; Partially-decomposed organic manures, 



