HELMHOLTZ, Hermann Ludwig Ferdinand von. Handbuch der Physiologischen Optik, Leipzig: Leopold Voss, 1867. 8°, 11 plates, 1 part-coloured (spotting and browning), illustrations, contemporary half calf, spine lettered in gilt (a little worn). FIRST EDITION. Garrison & Morton 1523: "One of the greatest books on physiological optics. It includes Helmholtz's revival of the Young theory of colour vision"; Waller 4299; Norman 1046.