. 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, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. ELECTRO - HORTICULTURE ELEUSINE 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 de
. 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, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. ELECTRO - HORTICULTURE ELEUSINE 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 whether there are injurious ele- ments in the spectrum of the given light. The spectrum of the electric arc light is the spectrum of carbon phis tliat of certain gases incident upon com- bustion. The 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 the 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 reduced to a minimum. Long-continued experiments at Cornell University have shown that each kind of plant behaves in its own way in the presence of electric light. It is not possible to prophesy what the results may be in a given species. A few plants, as tomatoes, English cucumbers, and carrots, seem to be very little atfected either injuriously or bene- ficially. Nearly all flowers are hastened into bloom by the influence of the light, and their colors are often brighter than under normal conditions ; but in many instances they do not last so long. The best results are secured if the light is applied to the when they have reached nearly or quite their full stature. If applied very early in their growth, they tend to make flowers before the plant has attained sufBcient size. In floriculture, therefore, the chief practical
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