frozen in the ice (from 1940 outbreak). The great abundance of rodents in 1940 coincided with a large number of their natural enemies- fox, wild cat (huiña), puma, owls. The invasion of rodents lasted one year. A police station "Lago Puelo", in charge of Cabo Ortega, received such a quantity of rodents that the police could not sleep and they killed with sticks 3,000 animals in one night. Oryzomys and other rodents ascend spiny bushes to protect themselves against their enemies. Chile: Another grass bamboo Chusquea quila flowers and dries up every 25 years, according to Otto Urban, with the same phenomenon: enormous production and suicidal emigration of rodents and the arrival of large numbers of natural enemies. It is probable that the Caña colihue will flower, fruit, and die about 1980. * * ** * Dr. Venzano is an elderly (over 80?) physician and long-time resident of El Bolson. He is widely known xxxxx as an amateur natur- alist who has done a lot of camping, sometimes to the dismay of his patients. When we stopped to see him in El Bolson in April of 1978, he was off backpacking by himself in the mountains. * Río Esperanza Norte is presumably west of Lago Puelo, see map in later notes