. The book of water gardening;. Aquatic plants. [from old catalog]. THE BOOK OF WATER GARDENING CHAPTER VIII HEATING THE TROPICAL LILY BASIN. A\'ING located a basin on the lawn, near the dwelling- house, it can be heated from the boiler used in the dwelling- during the Winter months, thus ena])ling one to grow the tropical lilies in the Northern States. All that is necessary is to place valves on the flow and return pipes near the boiler, so that the circulation can be regulated at will both as re- gards the house and the lily basin. A flow pi])e can be taken from the boiler, covered with asbe


. The book of water gardening;. Aquatic plants. [from old catalog]. THE BOOK OF WATER GARDENING CHAPTER VIII HEATING THE TROPICAL LILY BASIN. A\'ING located a basin on the lawn, near the dwelling- house, it can be heated from the boiler used in the dwelling- during the Winter months, thus ena])ling one to grow the tropical lilies in the Northern States. All that is necessary is to place valves on the flow and return pipes near the boiler, so that the circulation can be regulated at will both as re- gards the house and the lily basin. A flow pi])e can be taken from the boiler, covered with asbestos, and run through a terra cotta pipe to the basin, which it should enter about six inches below the water level. The return pipe should be taken through the wall of the basin near the bottom and back to the boiler in the same manner, and in the same trench as the flow pil'C. This will insure a free circulation of the water. There are two methods of heating a lily l:)asin with hot water—one by run- ning pipes all around the basin, thus heating the water by contact with the pipes; the other, to use the basin as a large expansion tank, the flow pipe entering the basin a few inches below the water level, and the return pipe running from the side opposite to that in which the flow enters, so as to insure a proper circulation and mixing of the water. The first mentioned method is the better of the two, but the more expensive, owing to the amount of pipe required. This will be described first: If it is de- cided to use the boiler located in the cellar of the dwelling house for heating the pond, the flow pipe, if possible, should be graded so that the highest point will be at the boiler and a gradual fall secured all the way to the basin. Near the boiler, at the highest point, means should be taken to carry off all air that may accumulate there. This can be done by a pipe running to the expansion tank comiected with the system, or a pet-cock can be used, which will have to be ope


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