"Zweifel Aug 27, 1935 as my dreams, at least more where the road crosses a for a mile downstream. The prominent trees are walnuts and willows. The flow of Yanks spring is piped into a cattle watering tank. Just below the spring there appears a good flow of water in the streambed. Minnows (Stella dittonia) are in the streams and in most all of the iso- lated pools. Rana pipiens was very commonly observed both along the streams and in shaded, isolated pools. Rana tarahumarae were found in one 3 deep rocky pool deeply shaded by a large willow. The water temperature was 27°C near the surface but cooler deeper down. The frogs were sitting around the edge of the pool when first seen, but dove in and set on the bottom when frightened. They are easily collected with a net. This pool is not stagnant, but get[s] part of the stream flow. The restriction of the frogs to these rocky pools is quite evident. Four were collected here while none were seen in the rest of the mile or so of canyon investigated.