Davis 16 1946 Big Rock Creek, Angeles Nat'l For., Los An- gels Co., Calif. May 6, 1946 Creek had plenty of water in it, but the canyon walls are far too steep, about a 45° slope, and the slopes themselves are covered with a finely divided, treache- rous sliding talus. There is no under- cover, and the trees, mostly Q. chryso- lepis and P. ponderosa, are scattered. Consequently these slopes are far too dry for Ensativa, and the dirt beneath fallen logs is rather dry. We drove to the canyon of the South Fork of Big Rock Creek, but could see from the road that the same conditions prevailed. All of the canyons in this area seem about the same—the walls being sparsely vegetated, so steep that run-off is too rapid for any extensive moisture retention. Drove on to Valermo, which consists of 1 gasoline station store, and on out to Hiway 138, and esta- blished camp in the creosote truck lum- works at about 6:30. Tomorrow we plan to drive to Agusta thence to Crys- tal Lake, our last chance for Ensativa croceata in the San Gabriel Mts.