Two hundred and twenty-five Lebanese elementary school children were interviewed. The ability to conserve number" and liquid" increased with age. Lebanese children lagged behind American middle-class children. (DM)

The purpose of the study was to predict the outcome of a stroke victim's vocational rehabilitation through the use of demographic and medical data. Characteristics of stroke clients were used to develop an eight-factor stroke rating scale. Recommendations for further refinement of the scale were included. (Author)

The applicability of Smallest Space Analysis is demonstrated by scaling a conditional proximity matrix of choices of fields of study. (Author)

This paper estimates for a given year (1959) both rates of return and present values to taking additional schooling in Puerto Rico, and relates these rates and present values to the increase in schooling per male worker in broad occupational categories over the 20 years, 1940-1960. (Author/RY)

A description of a week's work in mathematics carried out by a first year group of grammar school boys, answering the question which is the title of this article. (MM)

The relation between maternal presence and infant's vocalization depended upon the infant's state: when the infant was in the active awake state, he vocalized less in the presence of the mother than when alone, thus indicating that the majority of early vocalizations are associated with a non-social situation. (Authors/RY)

Results indicated that availability of categories rather than frequency of words seemed most crucial in determining developmental changes in clustering efficiency. (Authors)

An experiment was conducted comparing the effectiveness for producing response inhibition of high- and low-intensity physical punishment and elaborated verbal punishment when punishment was delivered either early or late in a response sequence. (Author)

Concludes that the skin color of Negroes is only a strong predictor of anti-white system" feelings among working-class and lower-class persons, those with no social contacts with whites, and those who feel powerless to exert control through institutional channels. (DM)