Chapter I. Scope and Outlook II. Factors in Embryogenesis III. Factors in Embryogenesis (continued) IV. Embryogenesis in the Algae V. Embryogenesis in the Bryphyta VI. Embryogenesis in the Psilotales and Equisetales VII. Embryogenesis in the Lycopodineae Lycopodium and Phylloglossum VIII. Embryogenesis in the Lycopodineae Selaginella and Isoetes IX. Embryogenesis in Eusporangiate Ferns X. Embryogenesis in Leptosporangiate Ferns XI. Embryogenesis in Gymnosperms Cycadales and Ginkgoales XII. Embryogenesis in Gymnosperms Coniferales and Gnetales XIII. Embryogenesis in Flowering Plants General Section XIV. Embryogenesis in Flowering Plants Special Section XV. Embryogenesis in Flowering Plants Analytical and Experimental Investigations XVI. General Conclusions