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Ponderosa pine twigs collected from trees used by tassel-eared squirrels as sources of cortical tissue for food contained smaller amounts of monoterpenes than twigs from similar trees not used by the squirrels as food sources. Of the 18 monoterpenes isolated from the twig samples, alpha-pinene was the best single predictor of food source trees. In experiments with captive tassel-eared squirrels, consumption of a preferred food was inversely correlated with the concentration of alpha-pinene added to the food.

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Bateson and Chantrey have suggested that the characteristics of complex objects may be learned by young animals by sequential exposure to parts or views of the object. The various component stimuli are said to be "classified together" as the animal learns to perceive its world. Consequently, domestic chicks given the opportunity to classify together color stimuli are subsequently less able to discriminate between them than are controls. Nine experiments were designed to investigate this phenomenon further. Chicks were exposed either to colors or to shapes and subsequently trained to discriminate between them, and their discrimination performance was compared with that of nonexposed controls. In only two experiments, one of them a near replication of Bateson and Chantrey's work, were their findings reproduced.Recent experiments by Bateson and Chantrey (1972) and Chantrey (1972 showed that young domestic chicks learn to discriminate between two colors more rapidly if the colors are unfamiliar. Specifically, chicks exposed to red and green objects during the first 5 days after hatching later learned to discriminate between red and green more slowly than chicks exposed to only blue objects. This result is the opposite of the findings of earlier experiments in which exposure to the discri-