CONTENTS 



XUl 



212 ; Localities subject to frosts, 21.3 ; Thermal belts, 214 ; 

 Liability to frost, 215 ; Methods of preventing injury by 

 frost, 216. 



CHAPTER IX 

 The Plant as Affected by Water ..... 

 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 pla?it 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. 



129-136 



CHAPTER X 



The Plant as Affected by Unfavorable Light and 

 Wind .......... 



Excessive light : Shading plants, 235 ; Cauliflower 

 heads, 236. Plants as affected by insufficient light : 

 Abnormal development, 237 ; Close planting, 288 ; 

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

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

 Platits as affected by excessive wind : Preventive meas- 

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

 gous attacks, 245 ; Frost damage, 246 ; Pollination, 247. 



137-143 



CHAPTER XI 

 The Plant as Affected by Unfavoeable Food Sttpplt 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, 25£> 

 Importance of nitrogen, 254 ; The sources of nitrates, 

 ?55 ; The conditions affecting nitrification, 256 ; Soil 

 aeration, 257 ; Partially-decomposed organic manures. 



