. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. ELECTRU -HORTICULTURE LLEUSINE 527 artificial light hastens assimilation, and thereby causes plants to grow more rapidly. The practical questions to be considered are, therefore, the expense of using the light and determining whuthtr there are injurious ele- ments in the spectrum of the givt-n light. The spectr
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. ELECTRU -HORTICULTURE LLEUSINE 527 artificial light hastens assimilation, and thereby causes plants to grow more rapidly. The practical questions to be considered are, therefore, the expense of using the light and determining whuthtr there are injurious ele- ments in the spectrum of the givt-n light. The spectrum of the electric arc light is the spectrum of carbon plus that of certain gases incident upon com- bustion. TIte spectrum of the arc light is rich in rays which lie beyond the luminous part, and these rays are very injurious to most plants. These rays of tht* ultra-violet part of the spectrum are eliminated by a plain glass, so that -when the electric light is surrounded by a globe, or when the light is hung above the roof of the greenhouse, the injuries are reduceefore the normal crop. As a rule, better results are secured when the light runs only half the night. A common two-tbousan<l candle-power light has a marked etJect on the growth of man}' plants at a distance of sixty to even one hundred feet. The incandescent light has a similar influence, but not so marked. The incandescent or Welsbach gas light is also capable of hastening the growth of plants. As now understood, the application of the electric light to the growing of plants is a special matter to be used when the climate is abnormally cloudy or when it is desired to hasten the maturity of crops for a particu- lar date. Only in the case of lettuce has it been prove<I to be of general conmiercial importance; an<! even with lettuce, it is doubtful if it will pay for its cost in cli- mates which are abundantly sunny. For the literature of the subject, consult the publications of the Experi- ment Stations of
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