In his introduction Lester del Rey dubs Willy Ley an ""ologist"" and he certainly needs no confining prefix in these essays reprinted from his column in Galaxy Science Fiction. Ley's look at Atlantis takes us to the Santorini Islands off the coast of Greece which (he claims) were originally the seat of the momentous volcanic explosion that wiped out a thriving Minoan culture on Crete and became the basis for the legend. Other Essays touch on the (thus far) impossible attempts to salvage the twenty million in gold of the sunken treasure ship La Lutine which has been tantalizingly just offshore since the 1880's. Then there are new facts as well as old myths destroyed about the Great Pyramid; a dissertation or who invented the crossbow; data on the extinct(?!?) giant sloth; tracers on the dodo and moa; a history of the sun spot phenomena and a revision of thinking about the Moon, Mars and Venus (courtesy of recent space probes). Potentially popular popularization.