close under the glass, and resting on the borders. The arrangement may be understood from the subjoined diagram.
ARRANGEMENT OF PIPES IN EXAMPLE OF HEATING ON THE LEVEL.
A. Entrance to lean-to. B. Entrance to Paxtonian. C. Boiler.
D. Flow. E. E. Return. F. Forcing-pit.
The solution of a difficulty in this simple way is a matter of more than passing interest, for where it appeared impossible to employ a hot-water system it has been effectually accomplished, and a most excellent forcing-pit obtained into the bargain. It is an important exemplification of established principles that the lean-to which adjoins the boiler, and receives its pipes directly from it, obtains far less heat than the Paxtonian, which is twenty-five feet distant, and the pipes which
