Glue
an impure gelatine. It is preand horns. Good glue is semi-transparent, and free from spots and clouds. ent, and free from spots and clouds.
When wanted for use, it is broken in pieces and steeped in cold water till it softens and swells. It is then melted over a gentle fire, or, what is better, in a water bath, and applied in a liquid state with a brush. Marine glue is a composition used for cementing materials that are exposed to moisture. It is made by dissolving 1 part of india-rubber in 12 parts of mineral naphtha, and adding 20 parts of powdered shellac. It not only resists wet, but cements glass and metals as well as wood. White fish-glue, or diamond cement, is made of isinglass dissolved in alcohol.