In making amber varnish, place 141b. of rock salt dissolved in spring water and 71b. of ordinary amber in a crucible over a fire till the amber is perfectly white. The bleached amber is then heated in an iron pot till entirely dissolved. When cool, the amber is taken out and well washed in spring water to eliminate the salt. It is then placed in the pot again and heated till dissolved, then poured out and spread over a clean marble slab to dry, any humidity that may remain being removed by gentle heat or sunshine. The amber is then powdered and again heated, with frequent stirring, till it is of the desired fluidity. When cool, purest turpentine in a warm state is added till the composition is of the required consistency. The gum also readily dissolves in pure chloroform, or in a mixture of spirits of turpentine and alcohol, the whole being heated for several hours in a closed vessel. It also yields to the action of sulphuric acid. The manufacture of amber varnish on a small scale without the aid of special plant is not reci m-mended.