. Florists' review [microform]. Floriculture. 110 The Rorists' Review November 16, 1918. You are Saving Money rWHEN YOU BUY A WILKS SELFFEEDIKG HOT WATER BOILER BUILT FOR BEGINNERS Wilks Hot Water Boilers are made of the best quality of steel, strongly riveted and calked, with no cast iron sections to crack and leak. SEND FOR OUR CATALOGUE. It tells all about our heaters, shows their economy and gives specimen plans for heating a model greenhouse. S. WILKS HFG. CO., 3523 Shields Ave., CHICAGO Established 1857 Telephone Yards 866. Mention The Review wbHti you wrlt>. Creenhonse Heating. ^^^^'

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. Florists' review [microform]. Floriculture. 110 The Rorists' Review November 16, 1918. You are Saving Money rWHEN YOU BUY A WILKS SELFFEEDIKG HOT WATER BOILER BUILT FOR BEGINNERS Wilks Hot Water Boilers are made of the best quality of steel, strongly riveted and calked, with no cast iron sections to crack and leak. SEND FOR OUR CATALOGUE. It tells all about our heaters, shows their economy and gives specimen plans for heating a model greenhouse. S. WILKS HFG. CO., 3523 Shields Ave., CHICAGO Established 1857 Telephone Yards 866. Mention The Review wbHti you wrlt>. Creenhonse Heating. ^^^^' I- . I , 1 ? ? ?—., , , , . _ SuBSCBiBERS are invited to write the Editor of this Department with regard to ftnj details of greenhouse heating that are not understood. But please do not ask The Review to make a choice of ap- paratus for you. The greenhouse heating equipment advertised in this paper is, we believe, the best for the trade to buy, and each article the best in the speciid field of its adaptation. ABOUT BOILEB COMPOUNDS. Will you kindly give ua some advice as to the selection of a good boiler com- pound? One of our engineers is desir- ous of using coal oil, but we are some- what skeptical about its effects, never having heard of its being used as a boiler compound. Do you know any- thing about it! What compound do you consider the best? C. W. D.—la. Especially when none of the pre- pared boiler compounds is readily avail- able, coal oil (kerosene) is often used and it gives satisfactory results, not only in the boiler itself but in the heat- ing coils, where it lessens oxidation. About one pint per month is used for a 50-horsepower boiler, and the same pro- portion in larger and smaller boiler's. Another material which serves the same purpose, and which is readily ob- tainable, is sal soda. One pound of this may be dissolved in a gallon of water and used in a SO-horsepower boiler. It will cause the water to foam and after four or five days the boiler should be thoro

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