THE ladies' conversazione at the Royal Society is always a brilliant function, and last week the presence of delegates and other distinguished foreign guests from the Darwin celebration at Cambridge added to its interest. The conversazione was held on June 24 in the rooms of the society at Burlington House, and the guests were received by Sir Archibald Geikic, K.C.B., president. Many of the exhibits were also shown at the conversazione held in May, and were described in NATURE of May 20 (vol. lxxx., p. 347). Summaries of the other exhibits are given below, based upon the descriptions in the official catalogue, related subjects being here grouped together for convenience of reference.