As a cement for white marble, use line plaster-of-Paris mixed to the consistency of thick cream. A thoroughly satislaetory job, however, cannot be made in the case of a mantelpiece, as the repair will show in time. For black or coloured marble use brown or orange lac, obtainable from dry-salters or chemists. Warm the broken pieces of marble before the fire, then place on the lac, and when melted press the two pieces together until firmly set-a, few minutes will suffice; the superfluous lac should be squeezed out whilst it is warm. If desired, the lac may be prepared in sticks bymelting it on a hot plate,adding the requisite colouring matter in the shape of oxides, and then rolling into sticks similar to sealing wax.