Recognition that people are divided by a common language is typically marked by a search for culprit ambiguities – but rarely so when name philosophers are involved, for whom continued talking past each other may seem the easier option.Whether the case of Carnap and Quine fits this profile is my quarry here. I begin with Quine’s conjecture that it was Neurath’s influence that made Carnap introduce the paragraphs into the Aufbau that promised, without elaboration, a conceptual genealogy on a physical basis. I argue that are good grounds to support Quine here. The analysis will be supplemented with remarks about later disagreements between Carnap and Neurath.