On the flats near the shore were large corrals still kept in good repair. New walls were being built by the Indians at the time of our visit. Near the southeast corner of the lake were a few modern huts built of stone and adobe, with thatched roofs, inhabited by drovers and shepherds. We saw more cattle at the east end of the lake than elsewhere, but they seemed to prefer the sweet water grasses of the lake to the tough bunch-grass on the slopes of Sarasara. Viscachas were common amongst the gray lichen-covered rocks. They are hunted for their beautiful pearly gray fur, the "chinchilla" of commerce; they are also very good eating, so they have disappeared from the more accessible parts of Peru. One rarely sees them, although they may be found on bleak uplands in the mountains of Uilcapampa, a region rarely visited by any one on account of treacherous bogs and deep tams. Writers sometimes call viscachas "rabbit-squirrels." They have large, rounded ears, long hind legs, a long, bushy tail, and do look like a cross between a rabbit and a gray squirrel. Surmounting one of the higher ridges one day, I came suddenly upon an unusually large herd of wild vicuñas. It included more than one hundred individuals. Their relative fearlessness also testified to the remoteness of Parinacochas and the small amount of hunting that is done here. Vicuñas have never been domesticated, but are often hunted for their skins. Their silky fleece is even finer than alpaca. The more fleecy portions of their skins are sewed together to make quilts, as soft as eider down and of a golden brown color. After Mr. Tucker finished his triangulation of the lake I told the arrieros to find the shortest road home. They smiled, murmured "Arequipa," and started south. We soon came to the rim of the Maraicasa Valley where, peeping up over one of the hills far to the south, we got a little glimpse of Coropuna. The Maraicasa Valley is well inhabited and there were many grain fields in sight, although few seemed to be terraced. The surrounding hills were smooth and well rounded and the valley bottom contained much alluvial land. We passed through it and, after dark, reached Sondor, a tiny hamlet inhabited by extremely suspicious and inhospitable drovers. In the darkness Don Pablo pleaded with the owners of a well-thatched hut, and told them how "important" we were. They were unwilling to give us any shelter, so we were forced to pitch our tent in the very rocky and dirty corral immediately in front of one of the huts, where pigs, dogs, and cattle annoyed us all night. If we had arrived before dark we might have received a different welcome. As a matter of fact, the herdsmen only showed the customary hostility of mountaineers and wilderness folk to those who do not arrive in the daytime, when they can be plainly seen and fully discussed.