1 The Time Scale and Some Evolutionary Principles 1
2 Genes as Determinants of Heredity 15
3 The Chemical Nature of Genetic Material 39
4 The Substructure of Genes 67
5 Protein Structure 98
6 The Biological Activity of Proteins in Relation to Structure 126
7 Species Variation in Protein Structure 142
8 Genes as Determinants of Protein Structure 164
9 On the Accuracy of Protein Synthesis 185
10 The Biosynthesis of Proteins 195
11 Genes,Proteins,and Evolution 211