286 THE GARDEN UNDER GLASS
the frame be merely garden soil or if it be put beneath the shade of a wall or a tree. Other important points are that there be no means of water draining into the frame, but, on the contrary, facility for its being taken out. To render the frame dry, let its four corners be stood upon bricks. Brick rubble or clinkers should then be put in until they are level with the bottom of the frame. Then a trellis bottom could be stood firmly over the rubble, and on this the plants would stand. Added to these precautions against dampness, the light must be in good repair, else every other precaution is wasted.