This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Our correspondent "Brooklyn," who furnished a description of his hot-beds in the February number for 1861, suggests as "an improvement in the construction of water hot-beds, to run the pipes through open gutters, or the bottom of the tight, to be kept always or ocasionally filled with water, as might be desirable according to the and of plants grown." He further says, "Since writing the above, I find tie same thing, and a still further improvement, in Hood on Warning . After speaking of objections to the tank system, on account of the difficulty of regulating the quantity of moisture, he says: It is probable that the most efficient way of applying hot water circulation, for producing bottom heat, would be by passing iron pipes through troughs made water tight, placed beneath the bed required to be heated, and filled with small loose stones, N. B. - These stones, when once heated, will retain their temperature for a great length of time, and by pouring water into the trough, vapor may be raised to any extent that may be required, the quantity being much or little, as circumstances may render desirable, or the heat may be continued without any vapor, whenever a dry heat is required.'" Our correspondent "Brooklyn" will no doubt be glad to learn that we have tried this winter something simpler and better with the most gratifying results.
According to Mr. Meehan, is not economical in small greenhouses. Brick flues are much cheaper and more economical. Iu large houses, however, the hot water apparatus is recommended as the best.