There was little rain during the night, and on May 6th we commenced the search of a range of forest on the south-west side of the Yana-mayu ravine, where we found a large supply of plants of _C. Calisaya_. At a height of 500 feet above the river there was a ridge of rock jutting out from the forest-covered sides of the ravine. In this spot the ground was not nearly so thickly covered with vegetation; there were no palms, tree-ferns, or plants requiring extreme moisture, and young plants received shade from taller trees, while they also enjoyed plenty of sunshine through the spreading branches. The most abundant plants were _Melastomas_, _huaturus_, and _Panica_, which climb amongst the branches to a height of thirty feet and upwards. These afford but very slight shade, and below there is an undergrowth of ferns, _Colocasiæ_, and young plants. In different parts of this ridge we collected 124 young _C. Calisaya_ plants, most of them root-shoots, and a few seedlings. There were also two young trees bearing capsules. The _C. Calisaya_ plants were all growing out of the moss which covered the rock to a thickness of eight inches or a foot, together with beautiful _Hymenophylla_,[338] but there was scarcely any soil. The roots spread along the face of the rock, which is a metamorphic clay slate, unfossiliferous, slightly micaceous, and ferruginous;[339] and is easily broken up into thin layers by the growth of the plants. In this situation the _C. Calisayas_ were more numerous than in any other we have yet seen. Two bears had made themselves a comfortable and very carefully prepared bed on the summit of the ridge, whence there was an extensive bird's-eye view of the windings of the river, and of the forest-covered mountains beyond. On the opposite mountains there were two or three long bare places--tremendous landslips, not unfrequent occurrences in the forest. There is a sudden crash, when masses of rock, huge trees, and underwood come rushing down in one fell irresistible swoop. A beautiful white _Stephanotis_ was climbing over the rocks. We returned to the camp in a heavy fall of rain, after a very severe but successful day's work, and found that both the Indians and ourselves had come to the end of our provisions, and that Andres Vilca Lad not returned. On May 7th we rose to find only a few bread-crumbs in the corner of our bag, and, as famine was thus knocking at the door, it became necessary to beat a hasty retreat. The plants were carefully packed in layers of moss, and sown up in two bundles of Russia matting, which we had brought with us, containing about 200 chinchona-plants. In the absence of Andres Vilca, Mr. Weir showed much zeal and energy in undertaking to carry one of these bundles, four and a half feet in circumference, over the slippery and dangerous road, in doing which he fell into the river.