Contrary to expectation, observable surprise proved infrequent in all groups studied. In contrast, changes in conservation judgment were frequent, although the degree of change was reduced somewhat if an appropriate explanation was required. (Author/CB)

Hypothesis that non-conservers would give more perceptual than identity arguments, and that conservers would give more identity than perceptual reasons for their judgments was supported by the conservation pretest results. (Authors)

Consists of 3 articles on developing recreation sites in cooperation with the U.S. Army Corps of Engineers. (NQ)

Compensation as assessed by any one test or criterion used is more difficult than conservation. And, the understanding of the compensation principle, as manifested in verbal statements, continues to develop well after the age at which liquid conservation may be taken for granted. (Authors)

The process by which a child learns music is discussed. (CK)

Describes a new, unified approach to introductory physics based on the conservation laws. classical and quantum physics are presented together as different levels of a unified and consistent description of the world. This approach has been used for the last 3 years as the first course in general physics for science and engineering students at…

Results confirm the hypothesis that identity and equivalence conservation require different mental processes. (Authors/MB)

Lack of spontaneous" development in the control group children is a matter of practical educational concern because it indicates the extent to which ESN children depend on explicit teaching for their mental advancement. (Author/SP)

Describes an apparatus designed for quantitative demonstrations of collision experiments. The apparatus consists of a transparent air table and a launching device for projecting two objects simultaneously. It may be used with an overhead projector. The apparatus won third prize in Demonstration Lecture Apparatus in the A.A.P.T. Apparatus…

Data on the conservation of discontinuous quantity are analyzed according to two different criteria: judgment only and judgment plus explanation. The results are discussed in terms of Piagetian theory and particularly of the assumption that language development is a consequence, and not a cause, of cognitive development. (Author/KC)

All of the children were presented conservation of liquid and weight problems and 12 metaphor items. The results suggest that hearing loss did not affect the solution of either conservation or metaphor. (Author)

Described is a technique for determining whether a student can conserve matter. This technique utilizes a square-triangle problem. Included are typical answers and Piagetian-type explanations for such answers. (DS)