Advances in Morphogenesis, Volume 6 considers the significant advances in various aspects of morphogenesis. This volume is composed of seven chapters that specifically cover the biological, morphological, and embryological aspects of cell growth and development. The opening chapter deals with the classification, progression, genetic aspects, and experimental induction of teratomas. The next chapter focuses on insect morphogenesis, its formation of surface patterns, the gradient organization of the epidermis, and the three-dimensional patterns resulting from cycles of activity in time. A chapter discusses the factors that control the initiation of hemoglobin synthesis, with a particular emphasis on studies of the chick and amphibian embryo. These topics are followed by surveys on heteroblastic development in vascular plants, the ultrastructure of the nucleus, and the experimental alterations of the developmental cytogenetic mechanisms. The final chapter examines the epigenetic aspect of developments in sexual organogenesis. This book is directed primarily toward developmental biologists.