Preface Denis C. Deeming and Mark W. J. Ferguson; 1. Maternal diet, maternal proteins and egg quality Harold B. White III; 2. Comparative composition and utilisation of yolk lipid by embryonic birds and reptiles Ray C. Noble; 3. Oviductal proteins and their influence on embryonic development in birds and reptiles Brent D. Palmer and Louis J. Guillette, Jr.; 4. Fluxes during embryogenesis Kenneth Simkiss; 5. Eggshell structure and formation in eggs of oviparous reptiles Mary J. Packard and Vincent G. DeMarco; 6. Shell structure and formation in avian eggs Ronald G. Board and Nick H. C. Sparks; 7. Physical characteristics of reptilian eggs and a comparison with avian eggs John B. Iverson and Michael A. Ewert; 8. Egg shape in birds Iain H. M. Smart; 9. The thermal energetics of incubated birds' eggs J. Scott Turner; 10. Physiological effects of incubation temperature on embryonic development in reptiles and birds Denis C. Deeming and Mark W. J. Ferguson; 11. Cold torpor, diapause, delayed hatching and aestivation in reptiles and birds Michael A. Ewert; 12. Physical factors affecting the water exchange of buried reptile eggs Ralph A. Ackerman; 13. The physiological and ecological importance of water to embryos of oviparous reptiles Gary C. Packard; 14. Roles of water in avian eggs Amos Ar; 15. Water economy and solute regulation of reptilian and avian embryos David Vleck; 16. The avian eggshell as a mediating barrier: respiratory gas fluxes and pressures during development Charles V. Paganelli; 17. Gas exchange across reptilian eggshells Denis C. Deeming and Michael B. Thompson; 18. Metabolism and energetics of reptilian and avian embryos Carol M. Vleck and Donald F. Hoyt; 19. Reasons for the dichotomy in egg turning in birds and reptiles Denis C. Deeming; 20. A comparison of reptilian eggs with those of megapode birds David T. Booth and Michael B. Thompson; 21. Why birds lay eggs Hermann Rahn; 22. Influences of incubation requirements on the evolution of viviparity Richard Shine; 23. Overview of early stages of avian and reptilian development Ruth Bellairs; 24. Ions and ion regulating mechanisms in the developing fowl embryo James I. Gillespie, James R. Greenwell, Elspeth Russell and Claire J. Dickens; 25. Electrochemical processes during embryonic development Paul O'Shea; 26. Methods for shell-less and semi-shell-less culture of avian and reptilian embryos Bruce E. Dunn; 27. Experimental studies on cultured, shell-less fowl embryos: calcium transport, skeletal development and cardio-vascular functions Rocky S. Tuan, Tamao Ono, Robert E. Akins and Masafumi Koide.