According to my careful trigonometric calculations the Duida mountain rises 2, meters above the Esmeralda plain, some 2, meters, more or less, above sea-level. I say more or less because I had the bad luck to break my barometer before our arrival in Esmeralda. The rain had been so heavy that we could not protect this instrument from the damp and, with the unequal expansion of the wood, the tubes snapped. This accident especially annoyed me as no barometer had ever lasted so long on such a journey. The granite summit of the Duida falls so steeply that Indians have not managed to climb it. Though the mountains are not as high as people think, it is the highest point of the chain that stretches from the Orinoco to the Amazon.