Charles Cruck-nell, St. Louis, says: - "A Boston correspondent in the March number enquires if there are any fcteam boilers in use for heating hot water pipes. There is one in use here, it is tubular, is eight feet long and thirty inches in diameter. It is used for heating a small hothouse, twenty feet long and twelve feet wide, and the dwelling house. It consumes twenty bushels of soft coal a day, requires the services of one man to attend it day and night, and it is absolutely unsafe to leave it at any time in the winter longer than six hours without attention. A city license is necessary to use it. This boiler with the silly arrangement of dwelling house and hothouse combined has sunk money enough in the three years it has been in existence to build and stock a large range of glass."