“…No separation was achieved when 4% of sodium borate was used in the place of the water in the mixture (4%, w/v, sodium borate-2-5 M-K2HPO4-2-methoxyethanol-33 % H3PO4; 1: 1: 1: 0-05, by vol. ), a result in agreement with the proposed structure for hyaluronic acid which contains no cis-diol groupings (Meyer, Fellig & Fischer, 1951;Jeanloz & Forchielli, 1951). Since Beale, Harris & Roe (1952) have shown that Rous-tumour RNA could be satisfactorily separated from hyaluronic acid by the use of hyaluronidase the investigation was not continued.…”