THE HORTICULTURAL SOCIETY OF NEW YORK 



feet, in only diffused light, the effect was marked. The light ap- 

 peared to injure young, newly transplanted plants. 



"5- Radishes were also benefited by the light, but not to a great 

 extent. When the light was hung in the house, however, whether 

 naked or protected by a globe, radishes were injured. 



"6. Beets and spinach appeared to be slightly benefited by the 

 light. 



"7. Cauliflower under the light tended to grow taller than in or- 

 dinary conditions, and to make fewer and smaller heads. 



"8. Violets and daisies bloomed earlier in the light house. This 

 corroborates results obtained with flowers in our earlier experi- 

 ment, 



"9. The electric light does not appear to determine or modify 

 the hours of growth of lettuce and some other plants which have 

 been studied in this particular. Plants which are benefited, simply 

 grow more rapidly during the customary periods. 



"10. I am convinced that the electric light can be used to ad- 

 vantage in the forcing of some plants." 



One of our next important experiments in America upon Elec- 

 tro-horticulture was carried on under the direction of J. L. R. 

 Hayden and C. P. Steinmetz. The experiment was started De- 

 cember 13, 1916, and ended February 24, 1917, or 73 days. 



Five-hundred watt gas-filled Mazda lamps were placed 36 

 inches above the ground and 17 inches apart. 



While the following report is discouraging from an economic 

 point of view yet it should not be overlooked that both of these 

 engineers claim that high priced plants for Christmas and Easter, 

 such as Poinsettias, Easter Lilies, might be raised economically 

 under artificial light, but they do not hold out much hope for 

 vegetable growers. 



TIME SAVED FORTY-SIX PER CENT. 



The following report is quoted from the General Electric Re- 

 view of 1918: 



"Artificial illumination has reduced the time required for the 

 development of certain plants by 46 per cent. 



"This means that under the influence of intense artificial illum- 



34 



