Introduction / Jane Maienschein
The mosaic theory of development / Edmund Beecher Wilson
The hereditary mechanism and the search for the unknown factors of evolution / Henry Fairfield Osborn
The problems, methods, and scope of developmental mechanics / Wilhelm Roux
Cleavage and differentiation / Edwin Grant Conklin
Relation of the axis of the embryo to the first cleavage plane / Cornelia Maria Clapp
Caspar Friedrich Wolff and the theoria generationis / William Morton Wheeler
Animal behavior / Charles Otis Whitman
The behavior of unicellular organisms / Herbert Spencer Jennings
Regeneration, old and new interpretations / Thomas Hunt Morgan
On the nature of the process of fertilization / Jacques Loeb
Epilogue / Paul R. Gross.
