April 17th. After walking for three hours we reached our boat at about eleven in the morning. Father Zea packed provisions of clumps of bananas, cassava and chicken with our instruments. We found the river free of shoals, and after a few hours had passed the Garcita raudal whose rapids are easily crossed during high water. We were struck by a succession of great holes, more than 180 feet above the present water-level, that appeared to have been caused by water erosion. The night was clear and beautiful but the plague of mosquitoes near the ground was such that I was unable to record the level of the artificial horizon and lost the opportunity of observing the stars.