L. Karlston 1954 Bufo boreas (45) July 5 bubbles may be formed. Usually, however, they work along edges of the dish, sometimes breaking film at the glass-air-oil interface. I blew gently down and across the oil film. The oil is readily forced to one side of the dish. The prevailing afternoon westerly winds in the valley undoubtedly (as noted at Stremen Meadow) force most oil to the leeward pond edges at least in larger ponds and puddles. The larger Hyler climbed out of the dish 4 times in 10 minutes. But after 10 o'clock it appeared unable to break through the film. 11:10 P.M. The metamorphosed Hyler immobile but least gular movements noted while frog on its back. Body covered with oil. The 4 toads still active and continue to work along upper edges. 12:15 P.M. One Bufo took olive but belly up at bottom of dish. Others slow decreased movements but still attempt to get air from surface. Symptoms of oxygen appear to be a definite continuation of metamorphosis, resulting in the lighter pigments slowing through. This is most pronounced in the Bufo which begin to take on Hyler coloration. 2 P.M. All toads death.