Copy letter from Robert William Frederick Harrison to The Editor, "Nature" 'Please make the following additions to the list of Probable Papers for November 16, sent to you yesterday: First on the list: Sir Ray Lankester, KCB, FRS - On the discovery of a novel type of flint implements below the base of the red crag of Suffolk, proving the existence of skilled workers of flint in the pliocene age. Last of the list: Prof E W MacBridge FRS - studies in heredity. I. The effects of crossing the sea-urchins, echinus esculentis and echinocardium cordatum.' 7 November 1911