Contents

17 February 1995
Vol 267, Issue 5200

About The Cover

John Dalton (1766-1844) is celebrated for developing the atomic theory of chemistry, but his first scientific paper to the Manchester Literary and Philosophical Society in 1794 was an account of how his color perceptions differed from those of other people. After 150 years, amplification of DNA from his preserved eye tissue has revealed the molecular basis for his color blindness. See page 984. [Engraving: Dated 1836, reproduced by permission of the British Library]