title: Conservation of liquid and solid quantity by the chimpanzee.
abstract: Sarah, an adult "language"-trained chimpanzee, made accurate same-different judgments on quantities of liquid and solid matter and conserved both types of quantity despite a transformation in an irrelevant property (shape). Control tests showed that she judged on the basis of inference rather than perceptual evaluation of the quantities. She failed to make accurate same-different judgments on the basis of number, and she was not tested for conservation of this type of quantity.
authors.forename: G
authors.initials: G
authors.lastname: Woodruff
authors.forename: D
authors.initials: D
authors.lastname: Premack
authors.forename: K
authors.initials: K
authors.lastname: Kennel