E J Grace, Grace Clinic, Brooklyn to the Editor, The Lancet, London Says he and his colleagues were interested in article on resistance to isoniazid - comments on results of clinicians ignoring basic principles of medical genetics - says Sir Alexander Fleming and Sir Howard and Lady Florey have visit Clinic and Genetics Laboratories at Cold Spring Harbor - is enclosing Editorial and letter published in 'Journal of the American Medical Association' 3 September 1952