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TEE POPULAR SCIENCE MONTHLY 



School Standing Corves. Boys. 



The base line divisions represent one year in age, while five of the vertical di- 

 visions equal one school grade. The average mark for each grade may be determined 

 by assuming that the first division of the grade represents a standing between 50 

 and 60 per cent., 2d between 60 and 70 per cent., 3d between 70 and 80 per cent., 4th 

 between 80 and 90 per cent, and 5th between 90 and 100 per cent. The degree of 

 pitch of the line shows the relative amounts of increase of absolute increments for 

 the same individual. 



The main educational corollaries which logically follow from this 

 study would require that our school systems, public and private, be 

 graded on the physiological age and the accompanying stage of mental 

 maturity of boys and girls in place of the chronological age, as is now 



