Daniel decided to step back and let Leibniz's words reverberate, as organ-chords must do in Lutheran churches. Meanwhile they reached the north end of the Bridge, where the racket of the water-wheels, confined and focused in the stone vault of the gatehouse, made conversation impossible. Not until they'd made it out onto dry land, and begun to ascend the Fish Street hill, did Daniel ask, 'I note you've already been in communication with the Dutch Ambassador. May I assume that your mission is not entirely natural-philosophick in nature?'