1. William Campbell Steere: An Outline of His Life and Continuing Career.- Bibliography of Publications of William Campbell Steere.- 2. Biochemical Systematics: II. A Reprise.- Micromolecules.- Flavonoids.- Terpenoids.- Alkaloids.- Other Micromolecules of Chemosystematic Interest.- Micromolecules of Specific Plant Groups.- Lichens.- New Approaches in Micromolecular Chemosystematics.- C4 Metabolism.- Paleobiochemistry.- Micromolecules: Biological and Evolutionary Considerations.- Macromolecules.- Electrophoresis.- Amino Acid Sequences.- Serology.- Nucleic Acids.- Conclusions and Future Prospects.- Micromolecules.- Macromolecules.- References.- 3. Species Selection As a Causal Process.- Differential Rates of Extinction.- Differential Rates of Speciation: General Problems.- Differential Rates of Speciation: A Case for Reducibility.- Differential Rates of Speciation: A Case for Irreducibility Speciation via the Founder Principle.- Discussion.- Possible Examples of Species Selection: Hawaiian Drosophilidae.- Possible Examples of Species Selection: Tertiary Neogastropoda.- The Snail Example: Another Viewpoint.- Species Selection and Randomness.- Species Selection and Punctuated Equilibria.- Conclusions.- References.- Species Selection As a Causal Process: A Reply.- References.- 4. Species Are Individuals: A Review and Critique of the Argument.- Introduction: What Is an Individual?.- Heraclitus Paradox.- The Organism As Paradigm.- The Firm As Paradigm.- Hydra As Paradigm.- Definitions, Words, and Things.- The Biological Species Concept.- Objectification of Species As Closed Systems.- Objectification of Species As Open Systems.- Pattern and Process: Complementary Views of Nature.- References.- 5. A Morphogenetic Approach to the Origin and Basic Organization of the Tetrapod Limb.- Morphogenesis and Homology: The Pattern of the Tetrapod Limb.- Invariance and Homology: The Pattern of the Tetrapod Limb.- Morphogenesis and Character Polarity: Von Baerian versus Haeckelian Recapl³ª