HELMHOLTZ, HERMANN VON. Handbuch der Physiologischen Optik. Leipzig, 1867. 11 engraved folding plates (one partially colored) and 213 text illustrations. 2 volumes in one, 8vo, contemporary quarter calf, edges worn, joints starting, uncut; some browning and scattered light foxing. FIRST EDITION. Garrison-Morton 1513; Grolier/Horblit 49a; Heirs of Hippocrates 1010.