. Cyclopedia of American horticulture, comprenant des suggestions pour la culture de plantes horticoles, les descriptions des espèces de fruits, légumes, fleurs et plantes ornementales vendues aux États-Unis et au Canada, ainsi que des notes biographiques et géographiques, et d'un synopsis du règne végétal. Jardinage -- Dictionnaires ; plantes -- Amérique du Nord des encyclopédies. Les émissions de C94 s'ils doivent être employés, des raccords d'eau chaude doit être sécurisé. Dans des conservatoires avec de hauts murs latéraux, il est souhaitable d'plaL-e les tuyaux d'écoulement à la plaque et le renvoie sur le mur ou sous

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. 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. C94 GREENHOUSE if they must be employed, special hot-water fittings should be secured. In conservatories with high side walls, it is desirable to plaL-e the flow pipes at the plate and the returns on the wall or under the tables. Pigs. 1001, 1002 and 1003 illustrate the lay out of pipes for water in a carnation, rose and violet house. Hot Water Under Pressure.—In some large Green- houses the hot water systems have been placed under pressure by closing the expansion tank. To prevent any danger of the blowing up of the system, a safety-valve, with a weight set so as to allow the water to escape be- fore the danger point is reached, is attached either to the tank or expansion pipe. The system being completely closed, the water as it warms is placed under pressure, and steam cannot be formed. This makes it possible to raise the temperature of water in the coils quite a num- ber of degrees higher than when an open tank is used. As there is even more danger from an explosion of a system when the water is under pres.sure than when steam is used, care should be taken to see that the safety- valve is in good working order, and that it is set at a point well below the danger limit. When water is carried under pressure, it permits of the use of smaller flows and returns, and a considerable reduction in the amount of radiating surtace. On the other hand, it is less economical in fuel than the open system, and requires rather more attention. The pressure system cannot be recommended for u.se under all condi- tions, and it will generally be best to have the piping adapted for all except the most severe

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