Book excerpt: Originally published in 1969, Intelligence and Cultural Environment looks at the concept of intelligence and the factors influencing the mental development of children, including health and nutrition, as well as child-rearing practices. It goes on to discuss the application of intelligence tests in non-Western countries and includes both British and cross-cultural studies to illustrate this. Inevitably a product of the time in which it was written, this book nonetheless makes a valuable contribution to intelligence theory as we know it today.