CHAPTER VI 

 LIGHT, HEAT AND VENTILATION 



LIGHT 

 Of all the factors that govern plant growth, 

 light is one of the most important. A plant may 

 be supplied with the proper soil, the requisite 

 amount of moisture and the temperature best 

 suited to its growth, yet unless it has the proper 

 amount of light the results are likely to be un- 

 satisfactory. The ability to secure the proper 

 amount of light is necessary for the best de- 

 velopment of the plant. Many flowering plants 

 fail to bloom through lack of sunshine, and here, 

 as well as with foliage plants, the growth be- 

 comes long and thin and the plant shows but a 

 faint trace of its possibilities. 



NECESSITY OF LIGHT 

 Light is absolutely necessary for the carrying 

 on of the vital activities of all plants contain- 



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