RT Journal Article SR Electronic T1 On normal quasi-vision of the moving blood-corpuscles, within the retina of the human eye JF American Journal of Science JO Am J Sci FD American Journal of Science SP 325 OP 338 DO 10.2475/ajs.s2-31.93.325 VO s2-31 IS 93 A1 Levi Reuben YR 1861 UL http://www.ajsonline.org/content/s2-31/93/325.abstract AB