Science: Mt. Roraima

At that jungle-covered spot of northern South America, where Venezuela, British Guiana and Brazil touch each other angularly, is Mt. Roraima, famed among travelers and explorers. It is a huge wall of red rock that rises, like a ruddy tree trunk, 1,500 ft. sheer above the surrounding plateau and altogether some 8,500 ft. above sea level. It seems unscalable.

However, a party of explorers from the American Museum of Natural History, who were back in Manhattan last week pallid from malaria, recently reached the top by following a ledge* that ran thinly up Mt. Roraima from the Brazilian side. Atop Mt. Roraima...