(1) Pure india-rubber 1 pt., dissolved by heat in naphtha; when melted, ;add shellac, 2 pts. (2) Glue, 12 pts., water to dissolve, and yellow resin, 3 pts. Melt, add turpentine, 4 pts., and mix. Portable, for draughtsmen: Glue 5 ozs., sugar 2 ozs., water 8 ozs. Melt in water-bath, cast in moulds, and dissolve for use in warm water. For bank-notes: Fine glue or gelatine, 1 lb., dissolved in water, and the water evaporated until nearly expelled. Add 1/2 lb. brown sugar, and pour in moulds. For gutta-percha: Common black pitch 2 pts., gutta-percha 1 pt. Mould into shape. Elastic: Dissolve glue in a water-bath, evaporate to a thick thud, and add an equal weight of glycerine. Cool on a slab. Liquid: (1) White glue 16 ozs , dry white-lead 4 ozs., soft water 2 pints, alcohol 4 ozs. Stir and bottle while hot. (2) Glue 3 pts. softened in 8 parts water. Add 1/2 pt. muriatic acid and 3/4 pt. sulphate of zinc. Heat to 176° Fahr. for 12 hours. Allow the compound to settle. heat and moisture-proof; Linseed-oil 4 ozs., 1 handful of quicklime; boil to good thickness, and cool. It will become very hard, but is as easily dissolved as com. mon glue. Water-proof, simple: Common glue 1 lb. boiled in 2 qts. skimmed milk.