Madam, - Apropos of Marie Murray's piece on smiling as a "human signal" (Health Supplement, January 30th), may I put in a word for the private smile? This is the one that makes me head every Tuesday morning for the disarming, gentle humour of the Artbeat cartoon on the supplement's front page. Congratulations to its creator. - Yours, etc,
OLIVER McGRANE, Marley Avenue, Dublin 16