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PREFACE T h e g rea t D arw inian tru th th at u nderlies o u r attem pts to discover rhym e a n d reason in the diversity o f life o n E arth is th a t n atu ral selection has shaped the form and behaviour o f organism s. T h e search for the evolutionary pathways th at lead to the p resen t diversity o f life, the study o f phylogeny, was am o n g the m ost pow erful forces in the d evelopm ent o f biological science in the latter p a rt o f the 19th a n d first h alf o f the 20th century. Itdoi:10.1098/rstb.1996.0105 fatcat:3jltnrcjmnhfdlvzhoyieyxw5y