Contents

27 April 1973
Vol 180, Issue 4084

About The Cover

Kittens reared during the first few months of life in a visual environment composed almost entirely of vertical stripes later exhibit an abnormally low acuity for horizontal gratings. See page 420. [D.W.Muir and D.E.Mitchell,Dalhousic University, Halifax, Nova Scotia, Canada; photograph courtesy of F.Stefani]