1. Anderson, J., and Weinbren, L (1961). Clin. chim. Acta, 6, 648.
2. Rose, G. A. (1964). Gut, 5, 274.
3. 'A cytohistopathologist's viewpoint' on related matters was the subject of a recent paper (Mclnroy, 1966) and the viewpoint was reiterated at the Annual General Meeting of the Association of Clinical Pathologists on;Sir,1966