| Description | Letter from Professor Karol OLSZEWSKI, Instytut Chemiczny, Cracow, Austrian Poland, to the Mineral Surveying Department, Ceylon, 31 May 1904. Re: is hindered in his researches on the physical nature of helium by a lack of sources, after reading Dunstan's and Ramsay's paper on thorianite, would like to know if he could obtain a quantity of the mineral. |