Studied the existing conditions and progress of the backward and defective children under such favorable surroundings and pedagogical procedure, which the physiological school afforded. The 53 normal children between ages 4 to 14 yrs and backward and defective children between ages 9 to 19 yrs were chosen for study. Sensory tests and motor coordination tests were given. Results showed that there was need of frequent psycho-physical examination of children. It has been emphasized that such results would help in the establishment of norms in terms of which children could be scientifically classed for pedagogical purposes. It was found that there was a uniform increase of ability at motor coordination as the intelligence arose and that lower the intelligence the more prominent was the element of fatigue. The abnormal child was found deficient in intensity and not in extent of psychic function.