Beiträge zur Entwickelungsmechanik des Embryo. Ueber die künstliche Hervorbringung halber Embryonen durch Zerstörung einer der beiden ersten Furchungskugeln, sowie über die Nachentwickelung (Postgeneration) der fehlenden Körperhalfte.

Roux is regarded as the founder of developmental mechanics (“Entwicklungsmechanik” as he named it). His work on the production of half-embryos initiated a turning point by shifting emphasis from descriptive to experimental embryology. Roux believed that the above work showed that the nucleus of each blastomere is capable of directing a specific independent line of differentiation. He eventually concluded that the nucleus is made up of hereditary particles. Partial English translation in No. 534.3.