GROTTO is also used for a small artificial edifice made in a garden, in imitation of a natural grotto.
The out-sides of these grottos are usually adorned with rustic architecture, and their inside with shell-work, coral, &c. and also furnished with various fountains, and other ornaments.
The following is recommended as a good cement for grotto work. Take two parts of white rosin, melt it clear, add to it four parts of bees-wax; when melted together, add some flower of the stone you design to cement, two or three parts, or so much as will give the cement the colour of the stone; to this add one part of the flower of sulphur: first incorporate all together over a gentle fire, and afterwards knead it with your hands in warm water. With this fasten the stones, shells, &c. after they are well dried, and warmed before the fire.