E.L. Karlstom 1954 Bufo boreas (12) April 24 Altamenas Meadow, 4000 ft., Yosemite Valley, Mariposa Co., Calif. 4:40 P.M. Pond A and other adjacent ponds searched for eggs and toads. No eggs present but some of the ponds have large numbers of toads - both Bufo and Boreas. Samples taken including both with approximate ratio if singly will not at random. Water temp. Pond A 21.50 C. with bulbs slotted. A long trough 11 yards SE of Pond A loaded with frogs. This pool measures 14 x 2 yards and parallels the pathway bisecting this side of the meadow. Air temp. 13° C. De max-min thermometer is submerged 3 inches in water. This means approximately a .5-.6 inch rise in level of Pond A. Max-min readings at 4:55 P.M. 32-84. The thermometer bulbs were 5" above water surface. Water temp. Pond A 4:52 P.M. 20.4° C. Sky clouded over again & found no eegs in Pond A or adjacent ponds. Soil temps. 5:05 P.M. Surface about 15° C. 6" depth 13.0° Air temp. 5:15 P.M. 12" " 11.0° 12.3° C. 18" " 10.5° 24" " 9.0 C. Meadow area S of Court Center, Yosemite Valley Mariposa Co., Calif. 7:45 P.M. Stedman and I checked this area thoroughly for signs of toads. An earlier check (6:30-7:00 P.M.) showed that extensive and varied breeding pools available.