On May 8th I left Gironda's clearing, with Martinez, in order to examine the forests above the hut of Tambopata, for plants of _C. Calisaya_. Here, in almost exactly a similar ridge of rock to those which proved so prolific of these precious plants on the heights above the Yana-mayu, and on the precipice of Ccasa-sani, I found a number of plants of _Calisaya morada_ (_C. Boliviana_, Wedd.), growing out of moss, amongst the rocks, with scarcely any soil. They were overshadowed by numerous trees, called by Martinez "Compadre[341] de Calisaya" (_Gomphosia chlorantha_, Wedd.), one of the most graceful and beautiful of the chinchonaceous plants, with deliciously sweet flowers. Dr. Weddell exactly describes it as rising without a branch above all the trees of the forest, and then spreading out in the form of a chandelier, and attracting the attention of the traveller from afar. The bark of this tree, with its transverse cracks, can with difficulty be distinguished from that of _C. Calisaya_. Whilst climbing amongst these rocks, I nearly put my hand on a small viper of a most venomous kind, 18 inches long, with a black skin marked with yellow rings, edged with white. In the evening we returned to Gironda's clearing at Lenco-huayccu, with eighty-seven chinchona-plants, sixteen of Calisaya fina (_C. Calisaya, var. α vera_), and sixty-nine of Calisaya morada (_C. Boliviana_, Wedd.). We found Gironda, on whom we were now entirely dependent for food, very little better off than ourselves. His supplies consisted of maize, yucas, aracachas, chuñus or frozen potatoes, and quispiñas, made of boiled quinoa-grains dried in the sun, ground, and preserved as little gritty hard lumps. He also had some _achocches_, which are poor watery cucurbitaceous things, squeezed, and served up in chupes. No salt. Though frequently baffled, and more than once exposed to much risk in making vain attempts, I had never given up my determination to have at least one day's work on the right bank of the Tambopata. For some days the volume of water had been gradually decreasing, but it was still 40 yards across, and rushing with great velocity over a ford which Gironda believed to exist a little below Lenco-huayccu. I stripped and went in, with the stem of a young _chonta_ palm as a support, but, on approaching the mid-channel, the water came up above my middle, the large pebbles slipped and rolled under my feet, and for some time it was with the utmost difficulty that I held my own; but finally we all reached the right bank in safety.