. Scientific American Volume 97 Numéro 16 (octobre 1907) . o se-cure comme près de l'animation de natu-ral effet solaire possible, et tolimit l'effet des rayons; et ifit est désiré de filtrer des plantes n'importe quelle partie des spectres, l'eau colorée peut être employée. Le toit du re-flector est pourvu d'une cheminée, pour permettre l'échappée dans le toit de la glasshouse des nitrusoxides qui peuvent être produites. Il est disposé que les lumières de thearc sont automatiquement constamment et almostimblement se déplaçant le long de toute la longueur vers l'arrière et vers l'avant de la serre, rayonnant faisceau apowerful o
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. Scientific American Volume 97 Number 16 (October 1907) . o se-cure as near animitation of natu-ral solar effect aspossible, and tolimit the effect ofthe rays; and ifit is desired to screen from the plants any portion of the spectra, colored water can be employed. The roof of the re-flector is provided with a chimney, to permit theescape into the roof of the glasshouse of the nitrousoxides that may be produced. It is arranged that thearc lights are automatically constantly and almostimperceptibly moving along the entire length back-ward and forward of the glasshouse, radiating apowerful beam of light on both sides of the house. The traveler is electrically driven, and the speedmay be controlled. By this plant Mr. B. H. Thwaites, who by the wayis a well-known electrician, hopes to secure the sixessentials which he regards necessary to force theplants growth. They are: (1) an ample supply ofviolet or chemically active rays projected from pow-erful and moving arc lamps; (2) a supply of electro-static current for the atmosphere and the roots; (3). Thwaites estimates that with his system, from threeto four producing seasons in the year will be attain-able. If, of course, choice fruits and flowers can beproduced at any period of the year at no great cost, the invention should certainly possess great com-mercial value. As already stated, at the moment itis purely in its experimental stage, the plant havingonly been in working order for just about a month, too short a period for one to predict likely results.At the same time, it is an experi-ment which will undoubtedly befollowed with the greatest in-terest. The Two Plants on the Right Have Been Stimulated into a Vigorous Growth by Electric Rays. an atmosphere containing moisture and carbondioxide in the proportion common to most fertilecountries; (4) a temperature within the limits of70 and 80 deg. Fahrenheit; (5) an ideal fertilizingagent; (6) an ample supply of water for the roots.It is also the inventors contention that t
