Do Zero Correlations Really Exist among Measures of Different Intellectual Abilities?

Whether measures of different intellectual abilities are positively intercorrelated has been a topic of interest and debate since the turn of the century. The data from an article by Guilford pivotal to this debate are reexamined. It is argued that, contrary to the original claim of the article, the data set of over 7,000 correlations does not provide support for the existence of zero correlations among tests of intellectual abilities.