| Water | 20 |
| Glue | 1 |
First boil the glue very carefully, and stir into it the finest wood-dust or cocoa-nut shell powder. The quality will be improved if the latter has already been steeped for some time in a strong solution of oak-bark or gall-apples in spirit, or, instead of the latter, water. This disposes the dust to amalgamate with the glue. Stir the whole thoroughly. A commoner or coarser preparation for simply repairing is made by combining plaster of Paris, glue in watery solution, and sawdust. Common bone-dust, plaster of Paris, and glue make a good cement for light wood-dust. With a little glycerine it can be used for moulding. Add a little pipeclay, and if the bone-dust be very fine the surface will take a very high polish. Finish with oil and hand rubbing. This composition combines well with perfectly softened and macerated paper—not merely soaked—to form panels, which, however, to make them hard, should be pressed or rolled.
Cements for deals or boards of soft wood:—
I.
| Caseine | 500 | grams. | |
| Water | 4 | qts. | |
| Spirit sal-ammoniac | 0 | .5 | qt. |
| Calcined lime | 250 | grams. |
II.
| Glue | 2 |
| Water | 14 |
| Cement lime | 7 |
| Sawdust | 3-4 |
For splits in trees, or fractures in the bark:—
| Pitch or resin | 50 |
| Tallow | 10 |
| Oil of turpentine | 5 |
| Spirits of wine | 5 |
The resin is first melted, the turpentine then stirred in, then the tallow, and finally the spirits.