Contents

07 September 1973
Vol 181, Issue 4103

About The Cover

Laysan albatross(Diomedea immutabilis), first identified by Rothschild in 1893. Award of the American Miscellaneous Society, presented to Roger Revelle in Mexico City, June 1973. See page 926. [Dan Dugan, photographer, Boston, for the Harvad Center for Population Studies, Cambridge, Massachusetts]