Letter from Howard Walter Florey to J R Casley-Smith, Villejuif Is returning Casley-Smith's paper on displacement of ferritin molecules by microtome knife - showed this to French, who showed it to a statistician - elaborate paper for important but small point - suggests Casley-Smith does not try to publish it as it stands but connects it with other papers - French will look through the other paper which arrived yesterday. 17 April 1962