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The establishment of continuation-schools and the development of group intelligence tests to the point where they can be given to relatively large numbers at one time with the assurance of reasonably accurate results, have recently provided new data for a scientific investigation of school mortality. Levi Hopkins, using these two newer methods of approach, questions the validity of the old explanation of economic necessity as the main cause for children’s leaving school as soon as they are able to do so. His study will attract marked attention not merely because it explores a neglected field but because his method of using intelligence tests is full of suggestion for investigators in other educational subjects.