In this book, Peirce’s logical apparatus is used to explain some topics in biology where traditional scientific methods fail to establish the relation between the real and the virtual in the genetic script, the irreducibility of evolution to the genome, and the multidimensionality of the passage from genotype to phenotype. The interdisciplinary nature of this study consists in combining Peirce’s triadic logic, linguistics and biology; the author, as a linguist, draws out similarities between sentence construction and protein folding. Three main branches from the biological sciences are focused on: evolution, epigenetics and protein folding. The volume applies Peirce’s logical tools to demonstrate the universal validity of his scientific method in the current research.