Abstract
Summary
A conditioned emetic reflex was usually, but not always, obtained in mature and immature doves and pigeons after 3 to 8 oral administrations of yohimbine hydrochloride. Individuals vary greatly in their normal emetic response to this drug, in their development of the conditioned emetic reflex, and in the constancy of its exhibition after it is developed. Though emesis is utilized normally to a far greater extent in mature than in immature birds our tests do not show that the conditioned emetic reflex is obtained in one age-group more readily than in the other.
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