Book excerpt: Written in a clear and graceful style, this classic work describes the principles of genealogical research, the evaluation of evidence, and the relationship of genealogy to chronology, eugenics, and the law; it discusses early nomenclature, royal ancestry, the use of source material, and the methods of compiling a family history. It is, in short, the very foundation of scientific American genealogy -- a manifesto of methods, aims, and principles.