“…As experimental evidence for the relatively high basicities of the oxides of these elements, one can cite the ease with which even the strongly ignited oxides of all but scandium dissolve in acids (66,79,250,263,285,305,416); dissolve in ammonium salt solutions with the liberation of ammonia (20,21,45,244,250,263,343); dissolve in aniline hydrochloride solutions (233); react with such hightemperature acids as ammonium salts (5,146,147,181,351,352,394,450), borax (31,154), metaphosphate (31), and alkali bisulfate (231,363) or pyrosulfate (11, 212); and absorb atmospheric carbon dioxide (114,250,263,278,285). To these can be added the comparatively high water solubilities and precipitation pH values of the hydrous oxides and hydroxides (64,65,74,167,222,297,327,361,389,398), the tendencies of at least some of the oxides to slake with water (244, 250, 278, 285), the absorption of carbon dioxide by hydrous lanthanum (12,...…”