Content: Advances in Photochemistry; Contents; Highly Complex Photochemical Mechanisms; The Kinetics and Mechanism of Photochemical Oxidation of Aldehydes by Molecular Oxygen; Singlet and Triplet States: Benzene and Simple Aromatic Compounds; Photochemical Rearrangements of Conjugated Cyclic Ketones : The Present State of Investigations; Photochemistry of Conjugated Dienes and Trienes; The Reactions of Sulfur Atoms; Some Photochemical Transformations of Polyenic Compounds; The Photolysis of the Diazirines; Author Index; Subject Index; Cumulative Index