Coloring matters for foodstuffs and methods for their detection. <A preliminary report made to the Association of Official Agricultural Chemists> ..

This is the view taken by Steven Smith, in his comprehensive and imaginative book, The Great Mental Calculators (1983). There have been, to my knowledge, no further studies of the twins since the mid-Sixties, the brief interest they aroused being quenched by the apparent 'solution' of the problems they presented. But this, I believe, is a misapprehension, perhaps a natural enough one in view of the stereotyped approach, the fixed format of questions, the concentration on one 'task' or another, with which the original investigators approached the twins, and by which they *W.A. Horwitz, etal. (1965), Hamblin (1966). +See Robert Silverberg's novel Thorns (1967), notably pp. 11-17. reduced them-their psychology, their methods, their lives-almost to nothing. The reality is far stranger, far more complex, far less explicable, than any of these studies suggest, but it is not even to be glimpsed by aggressive formal 'testing', or the usual 60 Minutes-like interviewing of the twins. Not that any of these studies, or TV performances, is 'wrong' ...»