. Les fleuristes [microforme] examen. La floriculture. 118 Les fleuristes^ 9 Examen CMBN, 1921. Chauffage serre les abonnés sont invités à écrire l'éditeur de ce ministère à l'égard de tous les détails des émissions de chauffage qui ne sont pas compris. Lorsque l'information est requise quant à la capacité de faire bouillir, ou la quantité de rayonnement nécessaire pour une serre, les températures nécessaires devrait être indiqué dans l'enquête, ainsi que la quantité de verre dans les murs latéraux, et les dimensions et l'organiser- ment des serres. Il est souvent utile de l'aide, également, d'avoir un croquis montrant l'emplacement o

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. Florists' review [microform]. Floriculture. 118 The Florists^ Review JcNB 9, 1921. Greenhouse Heating Subscribers are invited to write the editor of this department with regard to any details of greenhouse heating that are not understood. When information is desired regarding the capacity of boil- ers, or the amount of radiation required for a greenhouse, the needed temperatures should be stated in the inquiry, as well as the amount of glass in the side walls, and the dimensions and general arrange- ment of the greenhouses. It is often help- ful, also, to have a sketch showing the location of the houses. HEATING WITH EXHAUST STEAM. Practical and Profitable. There are many advantages in heat- ing greenhouses with exhaust steam, among which are the lessening of the danger of fire, the relief from the labor of firing and the removal of the cinders, and the securing of greater regularity in the hetxting. Where continuous serv- ice can he had from a power plant near by, this method of greenhouse heating is, at reasonable rates, a profitable one. A flat rate per thousand square feet of glass or of radiation is sometimes given, but the cost of heating varies so much in different years, and according to the condition of the glazing and the character of the exposure, that no gen- eral estimate can be given on this basis. The method of determining the charge for heating used by most central heat- ing plants is to base it upon the weight of the condensed water which is re- turned from the greenhouse coils, de- termined by a self-registering condensa- tion meter. The exact amount cliarjjcd for the service varies with the cost of fuel at the given point, as well as with the amount of steam used. Tlius, where fuel is cheap and where a large amount of steam is required, the charge may be as low as 4(i or 45 cents per thousand pounds of condensation. On the other hand, the charge may be as much as 75 or 80 cents per thousand pounds of condensation where the cost of coal is high a

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