The following investigation was undertaken to verify by the American Army Tests a result previously obtained by the use of Mr Cyril Burt's tests of intelligence (Journal of Experimental Pedagogy, vol. vi, No. 1), i.e. that there appears to be some likelihood that boys born in the spring months are slightly less intelligent on the average than those born in other months. Of these American tests (see Mental Tests in the American Army, C. S. Yoakum and R. M. Yerkes, pp. 220–230) the groups of tests marked “form 6” were used; but “test 8” was modified to suit British conditions by using test 8 of group 9 (p. 274, loc. cit.) as a basis, and replacing tests 1, 3, 7, 8, 9, 11, 13, 19, 35, 36, 38 by 8,1; 6, 3; 7, 39; 8, 39; 6, 35; 7, 36; 7, 38; 6, 39, and by three others of local interest.