... what lines of mental activity the child will be able to pursue with reasonable hope of success. In the diagnosis of a case of malnutrition, the up-to-date physician does not depend upon general symptoms, but instead makes a blood test to determine the exact number of red corpuscles per cubic millimeter of blood and the exact percentage of haemoglobin. He has learned that external appearances are often misleading. Similarly, every psychologist who is experienced in the mental examination ... — The Measurement of Intelligence • Lewis Madison Terman
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