A few examples of the various forms and arrangements of greenhouses may prove of more service to many readers of this book than the foregoing enumerations of elementary princi- ples. AVe shall begin with a very servicable span-roofed house,^ adapted for a mixed collection of plants, with pits adjoining on each side for bedders and. frame plants. It is designed with a view to secure the utmost economy consistent with eflBciency. It will be observed that the pitch of the roof is low, the ridge being only nine feet from the ground Hne. The width is twelve feet. In arranging the plants the tallest specimens are

SPAN-EOOF HOUSE WITH PITS FOE BEDDING PLANTS.

placed upon the centre stage, the next size on the side tables, and the smallest stuff in the pits on each side. By this arrangement everything will have ample head room, and at the same time be near the glass; moreover, they will be placed under the conditions most favorable for a frequent examii a- tion. If preferred, the walk may be made down the centre, with broad flat stages on each side. The house should be