The forests of the whole earth have been searched for woods adapted to the different parts of the instrument. Dr. Rimbault, in his learned "History of the Piano-forte," published recently in London, gives a catalogue of the various woods, metals, skins, and fabrics used in the construction of a piano, which forcibly illustrates the delicacy of the modern instrument and the infinite care taken in its manufacture. We copy the list, though some of the materials differ from those used by American manufacturers. MATERIALS. WHERE USED. _Woods._ _From_ Oak Riga Framing, various parts. Deal Norway Wood-bracing, &c. Fir Switzerland Sounding-board. Pine America Parts of framing, key-bed or bottom. Mahogany Honduras Solid wood of top, and various parts of the framing and the action. Beech England Wrest-plank, bridge or sound-board, centre of legs. Beef-wood Brazils Tongues in the beam, forming the divisions between the hammers. Birch Canada Belly-rail, a part of the framing. Cedar S. America Round shanks of hammers. Lime-tree England Keys. Pear-tree ---- Heads of dampers. Sycamore ---- Hoppers or levers, veneers on wrest-plank. Ebony Ceylon Black keys. Spanish \ Mahogany Cuba \ Rosewood Rio Janeiro | Satinwood East Indies |-- For decoration. White Holly England | Zebra-wood Brazils | Other fancy / woods / _Woollen Fabrics._ Baize; green, blue, and brown Upper surface of key-frame, cushions for hammers to fall on, to damp dead part of strings, &c. Cloth, various qualities For various parts of the action and in other places, to prevent jarring; also for dampers. Felt External covering for hammers. _Leather._ Buffalo Under-covering of hammers-bass. Saddle " " tenor and treble. Basil \ Calf | Doeskin |-- Various parts of action. Seal | Sheepskin | Morocco / Sole Rings for pedal wires. _Metal._ Iron \ Metallic bracing, and in various small Steel |-- screws, springs, centres, pins, &c., Brass | &c., throughout the instrument. Gun metal / Steel wire Strings. Steel spun wire Lapped strings. Covered copper wire " " lowest notes.