P6TOI5E-5TODY REtflEW 



% Devoted to Elementary Science in The Schools 



OFFICIAL ORGAN OF THE 



American Nature 



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MAY 8 J ]m 



PARLIAMENT BU'L-DINQS 

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Vol. 18 No 4 



APRIL, 192^2 



20c a copy SI. 50 a year 



Whole No. 153 



