Medium-ring Terpenes.- I. Introduction.- II. Terpenes Containing a Nine-Membered Carbon Ring.- III. Terpenes Containing an Eleven-Membered Carbon Ring.- IV. Terpenes Containing a Ten-Membered Carbon Ring.- V. Some Spectral Anomalies in Medium-ring Terpenes.- References.- Recent Advances in the Chemistry of Azulenes and Natural Hydro-azulenes.- I. Introduction.- II. Azulenes.- III. Naturally Occurring Hydroazulenes.- IV. Tables.- References.- Chemistry of the Natural Pyrethrins.- I. Introduction.- II. Nomenclature.- III. Isolation of Natural Rethrins.- IV. Structure and Chemistry of Chrysanthemic and Pyrethric Acids.- V. Synthesis of Chrysanthemic and Pyrethric Acids.- VI. Structure and Chemistry of Pyrethrolone and Cinerolone.- VII. Synthesis of cis-Pyrethrolone and cis-Cinerolone.- VIII. Synthesis of Pyrethrins and Cinerins.- IX. Allethrin.- X. Biosynthesis of the Pyrethrins and Cinerins.- XI. Synergists for Rethrins.- XII. The Insecticidal Activity of Natural and Closely Related Synthetic Rethrins.- References.- Conformational Analysis of Steroids and Related Natural Products.- I. Introduction.- II. Definition of Conformation.- III. The Existence of Preferred Conformations.- IV. Conformational Analysis of Reactions Controlled by Steric Hindrance and Steric Compression.- V. Spectroscopic Correlations.- VI. Effect of Conformation on Reactions with Stereochemically Demanding Transition States.- VII. Preferred Boat Conformations.- VIII. Conformational Driving Forces.- IX. Conformational Transmission.- X. Carbanion Reduction Processes.- References.- Biogenetic-type Syntheses of Natural Products.- I. Alkaloids.- II. Terpenes.- III. Some Other Natural Products.- References.- Der Kohlenhydratstoffwechsel im Roggen und Weizen.- I. Die löslichen Kohlenhydrate im Roggen undihre Konstitution.- II. Die löslichen Kohlenhydrate im Weizen und ihre Konstitution.- III. Die Biogenese der Polyfructosane im Roggen und Weizen.- Les phosphatases des végétaux supérieurs: répartition et action.- I. Les phosphomonoestérases.- II. Les phosphodiestérases.- III. Les pyrophosphatases.- IV. Rôle physiologique des phosphatases.- Bibliographie.- Namenverzeichnis. Index of Names. Index des Auteurs.- Sachverzeichnis. Index of Subjects. Index des Matières.