Humboldt resided for a time, 165 ft. in 64 years. At the same time Cotopaxi and Sangay, the two active volcanoes, have actually increased in elevation since the measurement of La Condamine in 1742. These changes in elevation, if correct, are due to seismic disturbances, a cause that may be partially responsible for the varying computations of the heights of these well-known peaks. Among modern investigators are W. Reiss and A. Stübel (1871-1873), and Edward Whymper (1880), whose measurements of the principal summits were:-- _Eastern Cordillera._ _Western Cordillera._ +--------------------------+--------+----------------------+--------+ | | Ft. | | Ft. | +--------------------------+--------+----------------------+--------+ | Cayambe (W.) | 19,186 | Cotocachi (W.) | 16,301 | | Sara-Urcu " | 15,502 | Mojanda (R. & S.)| 14,088 | | Antisana " | 19,335 | Pichincha (W.) | 15,918 | | Sincholagua (R. & S.)| 16,365 | Atacatzo (R. & S.)| 14,892 | | Rumiñagui " | 15,607 | El Corazon | | | Cotopaxi (W.) | 19,613 | (Chamalari) (W.) | 15,871 | | Tunguragua (R. & S.)| 16,690 | Iliniza (R. & S.)| 17,405 | | Altar (Capac-Urcu) " | 17,730 | Carahuairazo (W.) | 16,515 | | Sangay " | 17,464 | Chimborazo " | 20,498 | +--------------------------+--------+----------------------+--------+