The decision we took on the night of the 14th of July had a happy influence on the direction of our travels. Instead of weeks, we spent year in this part of the world. Had not the fever broken out on board the Pizarro we would never have explored the Orinoco, the Casiquiare and the frontiers with the Portuguese possessions on the Rio Negro. We perhaps also owed to this circumstance the good health we enjoyed for such a long period in the equinoctial regions.