1. Embryos and development 2. Embryos and adults 3. Cell reproduction and molecular replication 4. The gene and differentiation 5. Types of reproduction 6. The spermatozoon and the ovum 7. Gametogenesis 8. The embryo s beginning 9. Reorganizing the zygote preformation versus epigenesis 10. General and unique features of cleavage 11. Types of cleavage descriptions and comparisons 12. Consequences of cleavage analytic studies 13. The descriptive anatomy of blastulas 14. Pattern formation in the blastula 15. Activating the blastula s genome and inaugurating 16. Genetic versus embryological concept of development 17. Defining the gastrula 18. Developmental anatomy of lecithotrophic gastrulas 19. Developmental anatomy of gastrulas from microlecithal and mesolecithal eggs 20. Mechanisms and controls of gastrulation 21. Germ layers and gastrulas phylogeny and ontogeny 22. Homology the genetics of cell lineage homeotic mutants homeoboxes and pou 23. Establishing the vertebrate body plan palingenesis versus plasticity 24. Cenogenesis in vertebrates 25. Vertebrate organogenesis 26. Specification of the nervous system