This booklet was written to provide owners of historic furniture accurate information about furniture and the causes of its deterioration so that they can properly care for their pieces. A discussion on the biological, chemical and physical properties of wood is provided. This enables the reader to have a basic understanding of the underlying causes of furniture deterioration. The technology of adhesives and finishes is included as well as a summary of furniture construction techniques. The detrimental effects of improper or fluctuating temperature and relative humidity levels are described along with other important causes of furniture deterioration. A summary is given on proper preservation and care of furniture which includes a listing of the ideal environmental conditions for furniture. Several common myths about wood and the care of furniture are enumerated. Many products traditionally used and currently advertised for furniture can actually damage wood and finishes over time. A discussion on the development of the furniture conservation profession and ethical code is related along with guidelines for choosing a good furniture conservator.