Abstract

Each of the commentators on my Science as a Process has emphasized a different part of my book. Mishler concentrates on the relevant biology, Koertge expands upon the sociological mechanism I propose, while Bradie discusses biological and conceptual lineages as historical entities. I respond to these comments and criticisms, emphasizing the roles played by sequences of ancestor-descendant tokens in replication and ecological types in interaction. Hence, selection results from the alternation of genealogical tokens with ecological types in both biological and conceptual evolution.