April 28th. It poured with rain as soon as the sun set and we were worried about the damage to our collections. The poor missionary suffered one of his fever attacks and begged us to leave before midnight. After passing the Guarinuma rapids the Indians pointed out the ruins of the Mendaxari mission, abandoned some time back. On the east bank of the river, near the little rock of Kemarumo in the middle of Indian plantations, we saw a gigantic ceiba (the Bombax ceiba). We landed to measure it; it was some 120 feet high, with a diameter of 14 or 15 feet.