The publication of Daniel Lehrman’s 1953 paper, “A Critique of Konrad Lorenz’s Theory of Instinctive Behavior,” (_The Quarterly Review of Biology_ 28(4):337–363) exposed a gulf between comparative psychologists and ethologists regarding the concept of instincts. At the center of this debate was a rivalry between T. C. Schneirla—Lehrman’s doctoral advisor—and Konrad Lorenz. While Schneirla maintained that the concept of innate instincts mischaracterized developmental processes, Lorenz maintained that innateness was essential to understand the evolution of behavior. A year after the publication (...) of Lehrman’s paper, the Singer-Polignac Foundation organized a small conference where leaders in evolutionary biology, ethology, behavioral physiology, and comparative psychology met to discuss the concept of instinct and innateness. The result of this meeting was the publication of the book _L’instinct dans le comportement des animaux et de l’homme_ (M. Autuori et al. ( 1956 ) Masson, Paris) in which each conference participant submitted a chapter that was followed by a discussion among the participants. Here I review the historical context surrounding this conference with a republishing of the commentary on Schneirla’s chapter, “Interrelationships of the ‘Innate’ and the ‘Acquired’ in Instinctive Behavior.” Originally published in English, German, and French, the discussion is included here with a new translation into English for the first time. A companion article (this issue; G. M. Kohn (2024) “Revisiting T. C. Schneirla’s ‘Interrelationships of the “Innate” and the “Acquired” in Instinctive Behavior’ (1956)”) discusses and makes available Schneirla’s complete paper. (shrink)