Regarding your comments on claims made for homeopathy (Editorial, 27 September, p 3 and Letters, 18 October, p 58): criticisms centred around the vanishingly small number of solute molecules present in a solution after it has been repeatedly diluted are beside the point, since advocates of homeopathic remedies attribute their effects not to molecules present in the water, but to modifications of the water's structure.
Simple-minded analysis may suggest that water, being a fluid, cannot have a structure of the kind that such a picture would demand. But cases such as that of liquid crystals, which while flowing like an ordinary fluid can maintain an ordered structure over macroscopic distances, show the limitations of such ways of thinking. There have not, to the best of my knowledge, been any refutations of homeopathy that remain valid after this particular point is taken into account.
A related topic is the phenomenon, claimed by Jacques Benveniste's colleague Yolène Thomas and by others to be well established experimentally, known as "memory of water". If valid, this would be of greater significance than homeopathy itself, and it attests to the limited vision of the modern scientific community that, far from hastening to test such claims, the only response has been to dismiss them out of hand.
BRIAN D. JOSEPHSON