66 PSYCHOLOGICAL METHODS OF TESTING INTELLIGENCE 



one year to which 23 per cent, of the boys, but only 

 17 per cent, of the girls belong; the girls show a 

 correspondingly greater percentage of their num- 

 ber at or above age. 



TABLE VIII 

 SEX DIFFEBENCES AS SHOWN BY BINET TESTS (GODDABD) 



, Retarded * , Advanced ^ 



Two Years One One Two Years 



or More Year At Age Year or More 



Boys 18.5 23 34.5 20 4 



Girls 18.5 17 36.5 23 5 



Goddard's statement that retardation of marked 

 amount is more frequent with boys is not borne out 

 by his own tables, for the percentage of boys and 

 girls is here the same, 18.5. 19 



All the other investigators that have treated the 

 question of sex differences have obtained results 

 more favorable for the boys. 



Particularly decisive are the results obtained by 

 Bloch and Preiss (38) upon Volksschule children in 

 the manufacturing city of Kattowitz, in Upper 

 Silesia. They tested 79 boys and 71 girls aged 7 to 

 11 years, all of whom displayed average native abil- 

 ity and average school ability. The percentages 

 passing successfully the various tests show almost 

 in every one of them a very decided inferiority of 

 the girls. In Table IX I have brought together all 

 the tests for which Bloch and Preiss report the re- 

 sults separately for the two sexes. No particular 



19 It must, of course, be borne in mind tbat these are pupils of 

 schools for normal children, but the statement appears to be equally 

 untrue for abnormal children. From one of Chotzen's tables (44, 

 p. 462) I have calculated that excessive retardation, 5 years or 

 more, appeared in 7 of 158 feeble-minded boys (4.5 per cent), but 

 in 11 of 122 girls (9 per cent). 



