This book is intended to serve not merely as a source of information, like a dictmnan, but as a practical tool for the amateur collector. The presence of a signature is often the most serious pitfall for anyone who tends to respond eagerly to the question, 'Is it signed?' without asking also, 'Who ascribed that signature?' The con-temporary enthusiasm that demands a signature as the most conclusive evidence of authenticity needs to be reinforced by knowledge and experience. A reference book of signatures can give opportunities and prevent mistakes.