The sturgeon’s bladder, shredded, is dissolved with spirits of wine while remaining in a warm place; the gum is also dissolved in spirit and mixed with the sturgeon’s bladder; the whole must be then carefully and slowly boiled to a syrup. Close with a cork, as it is sure to gum tightly.
To improve Corks.—When bottles contain substances which adhere to the cork and harden, the latter should be first steeped in oil or vaseline, or boiled in a mixture of both.
Armenian Cement.—This is much like Diamond and Turkish cements:—
I.
| Sturgeon’s bladder | 600 |
II.
| Gum-ammoniac | 6 |
| Mastic | 60 |
The sturgeon’s bladder is dissolved in spirits of wine separately, the gum-ammoniac and mastic also, but with a minimum of spirit; the two are then combined.
A cement which will resist the action of spirits of wine will often be very valuable, as when large lids are to be fastened to jars containing anatomical preparations. One is made as follows:—
| Cleaned manganese powder | 20 |
| Soluble silicate of soda | 10 |