E.L. Karatau 1954 Buttor boreas (21) April 30 Elevation mdwr, 4000 ft., Yosemite Valley, Mergera Co, Calif. Night check for toads 8:50 P.M. (D.S.T.) Air 1" above dead grass 6.1° C, water in pond A 11° C. No signs of adults or recently laid eggs. Toads present but not abundant. Hydra out and rancous, one pair captured in amplexus. May 1 ½ mi. S Court. Center, Yosemite Valley. Some locality. Equipment at study site in good shape. Top of the stake on which the float rides in the pond 5¼" inches above water surface, indicating a pond rise of ~1½ inches. This put the lower edge of the tube spout about 2½" above surface water. Standing water now approximately 21 inches deep (wet), although not more than 1" deep where my footprints have sunk into the soil. Air max-min. (bulb 10" above ground) at 9:39 A.M. (D.S.T.) 28-74° F. Painted wooden housing, re-set thermometer and replaced. The tiny equipment is now mostly shaded by yellow pine to the E of the weather box. Estimate 80-90% shade since some sunlight filtering through pine foliage. Present air temp. 46°F. max-min. Soil max-min. not available since I found this thermometers broken. It was laid face downward and soil above carefully replaced April 24. Some metal housing will be necessary. Loves broken housing. The air and pond thermographs operating well. Wait and replace chart this afternoon before leaving valley.