MERSENNE (MARIN): COGITATA PHYSICO MATHEMATICA, Paris, sumptibus Antonii Bertier, 1644, 4 vols. in 2, 4to, first edition, vol I: (14), 370pp., vol II: (7), 96pp., vol. III: (5), 140pp. + index, vol. IV: (15), 589pp., woodcut illustrations and diagrams, including depictions of musical instruments (clean tear to 2H2 of vol. I, 2M3 in same vol. holed at upper margin, occasional browning), contemporary calf, gilt, sides with the coat-of-arms of Pierre Seguier (1588-1672), adopted after his appointment as Chancellor of France by Louis XIV (spines restored, upper joints cracked); sold not subject to return. [Brunet III, 1662; Honeyman 2217]