RT Journal Article SR Electronic T1 On the duration of color impressions upon the retina JF American Journal of Science JO Am J Sci FD American Journal of Science SP 243 OP 252 DO 10.2475/ajs.s3-28.166.243 VO s3-28 IS 166 A1 Edward L. Nichols YR 1884 UL http://www.ajsonline.org/content/s3-28/166/243.abstract AB