Originally published in 1985, The Semantic Theory of Evolution addresses the notion that life is not shaped by the single law of natural selection, but instead by a plurality of laws that resemble grammatical rules in language. This remarkable work presents a semantic theory centering on the concept of the ribotype. Supported by both sound facts and logical arguments, this analysis reaches beyond the established cadre of biological thought to unravel many of life’s mysteries and paradoxes, including the origin of the cell and the nucleus and the evolution of ribosomes.

The genetic code appeared on Earth with the first cells. The codes of cultural evolution arrived almost four billion years later. These are the only codes that are recognized by modern biology. In this book, however, Marcello Barbieri explains that there are many more organic codes in nature, and their appearance not only took place throughout the history of life but marked the major steps of that history. A code establishes a correspondence between two independent 'worlds', and the codemaker is a third party between those 'worlds'. Therefore the cell can be thought of as a trinity of genotype, phenotype and ribotype. The ancestral ribotypes were the agents which gave rise to the first cells. The book goes on to explain how organic codes and organic memories can be used to shed new light on the problems encountered in cell signalling, epigenesis, embryonic development, and the evolution of language.

DARWIN’S THEORY OF EVOLUTION ranks among the most influential of modern scientific theories. Applying the methodology of COGNITIVE SEMANTICS , this study investigates how metaphors based on domains of JOURNEY, STRUGGLE, TREE and HUMAN AGENCY serve to conceptualize key concepts of Darwin’s theory — such as evolutionary change, natural selection, and relationships among organisms. At the outset the author identifies original metaphors in The Origin of Species, to turn to their realizations in modern discourse on evolution in later chapters. Thus, the study uncovers how metaphors contribute to structuring the theory by expressing it in a coherent and attractive way, and how they provide mental tools for reasoning. As the first comprehensive study of conceptual metaphors that underlie Darwin’s theory and affect the way we talk and think about evolution, it may be of interest not only to linguists and evolutionary biologists but also to anyone interested in the interconnection between thought and language.

Traditionally a scientific theory is viewed as based on universal laws of nature that serve as axioms for logical deduction. In analyzing the logical structure of evolutionary biology, Elisabeth Lloyd argues that the semantic account is more appropriate and powerful. This book will be of interest to biologists and philosophers alike.