Mr. I. C. Wood, Fishkill, N. Y., says: "The article in February number, by Mr. Hippard, on 'Greenhouse Boilers' has no doubt been read by many interested in heating greenhouses, etc., especially by steam. He speaks of the boiler being economical in fuel, etc., which is really a very important item nowadays, especially so in this section, owing to high price of same. Now, would it not be well for Mr. H. as well as others, to give figures, as near as possible, of the quantity of coal consumed, kinds, sizes, etc., say for December and January? We put up a range of glass the past summer, about 24,000 feet, or about as much again as Mr. H., and put in two upright tubular boilers set so as to work them jointly when needed, and have been working so for the past two months. We maintain a night temperature of 54P to 580; the houses are new and tight, but the situation is very exposed from all sides; the temperature for December and January averaged very low, especially so for December, lower than for several years, though not so extreme as at other periods for short times; the lowest here was 8° below zero.

We use Pitts-ton coal, grate size, which costs us on cars at our station, $4.50 per gross ton, and we consumed for the two months, December and January, about 50 tons gross, or a total expense for coal of $225; it cost us to put it in bins about 30 cents per ton. Will others give their actual experience so we can better judge as to economy of boiler, etc? "