Four Peaks in Eight Days. During May 1946 William Hackett and A. B. Wheeler ascended Mexico’s four highest mountains in a period of eight days: 12 May, Popocatepetl (17,882 ft.); 13 May, Nevada de Toluca (15,120 ft.); 16 May, Pico de Orizaba (18,700 ft.); 19 May, lxtaccihuatl (17,328 ft.). They had left Los Angeles by car on 8 May 1946.