24 OCTOBER 1931, Page 17

THE COLOUR BAR [To the Editor of the SPECTATOR.] SIR,—Respecting

your correspondent Mr. Hubert Cartwright's question as to the possible hereditary mental distinction between the Nordic White and the Bantu, and experimental tests for such, the answer, perhaps, may be found in the interesting system of intelligence testing with which Dr. Haydn Brown, the well-known authority in neurology, is now experimenting. I was recently privileged to witness a demonstration of his system, which, operating as it appears onside of any educational qualifications, may be applied with equal fairness to the aborigine and a senior wrangler. Certainly the results arrived at on that occasion were striking enough to impress me very much.—I am, Sir, &c., ALAN R. WARWICK, 75 Beulah Hill, Upper Norwood.