Quest 1948 Journal 154 July 14 Visited this mine early this afternoon and did not find the bats as plentiful as our previous visit had found them. Only two bats were seen and both of them were captured. They were Choero- nycteris mexicana and found near the opening of a vertical shaft into the mine. July 15 8 mi N. Rosario, Baja California Was forced to camp here late yesterday afternoon due to the breaking of the right rear spring of the Dodge. Minimum temperature last night was 51°F. We are camped in a small wash in a topography of sedimentary clay and river washed boulder material. The wash runs in a north-south direction and contains but small amounts of coarse sand. The majority of the earth here is of clay and the wash bottom is almost entirely made up of that material and thickly overgrown with a dry bush of about two feet in height. The low hills surround- ding our camp are of clay interspersed with layers of gravel, the west-facing slopes grown chiefly with agave, the east-facing slopes chiefly with low bushes and becoming very dense in some