E.L. Karlstein 1954 Bufo boreas (49) July 19 Stromm Meadow, 4000 ft., Yosemite Valley matted down due to pedestrian use and the constant foraging of deer here. July 21 Sentinel Meadow, 4000 ft., Yosemite Valley, Mariposa Co., Calif. Night check of the meadow 10:45-11:15 P.M. (O.S.) Air temp. as noted thermometer Government Center garage area 74° F. at 10:15 P.M., but it was cooler in open meadow - possibly in high 60's. Not a call of any crunch breed, and I did not see a single food. Weather clear with no breeze. After, a check of Stromm Meadow between 11:20-12:00 turned up some results. Amphibian activity in the Valley is practically nil; it seems, due to hot weather and early drying up of water sources. July 24 Check made of Indian Run Spring, ¼ mile E of Indian Cave, 4050 ft., Yosemite Valley, Mariposa Co., Calif. No amphibian toda of any kind in this highly mineralized spring. Flow still producing slow-moving rivulets up to 8 feet across. Heavy algal development. Also check of meadows N side of Conze G, 4000 ft., Yosemite Valley. No standing water left even in deepest (to 2½') potholes. Very high development of grasses, milkweed, rushes, and a woody brush-like plant to 4' high (campsite ?) This meadow would be one of