From aqueous solution the octohydrate, ThCl₄,8H₂O, separates at ordinary temperatures; a heptahydrate and an enneahydrate have been described as precipitated from the alcoholic solution by addition of water. The _basic salts_, Th(OH)Cl₃,7H₂O and Th(OH)₂Cl₂,5H₂O, have been obtained by addition of the hydroxide to alcoholic hydrogen chloride. The _oxychloride_, ThOCl₂, may be obtained by the carefully regulated action of carbon tetrachloride on the dioxide, according to the equation: ThO₂ + CCl₄ = ThOCl₂ + COCl₂ It is a colourless crystalline solid, which takes up moisture from the air, forming the hexahydrate. _Thorium bromide_, ThBr₄, is a volatile solid which boils at 725°; it closely resembles the chloride. The _iodide_ and a _basic iodide_, Th(OH)I₃,10H₂O, are known. No cyanide of thorium is known, addition of potassium cyanide merely causing separation of the hydroxide. A _ferrocyanide_, Th[Fe(CN)₆],4H₂O, is thrown down as a white powder by potassium ferrocyanide; with potassium ferricyanide no precipitate is obtained. The _platinocyanide_, Th[Pt(CN)₄]₂,16H₂O, is obtained by double decomposition in yellowish-brown prisms. Among the halogen oxysalts, the _perchlorate_, _chlorate_, _bromate_, and _iodate_ were prepared by Cleve. The iodate is of great importance for purposes of detection and estimation, from the fact that, in presence of a large excess of alkali iodate, it is insoluble in strong nitric acid, whilst the analogous compounds of the rare earth elements dissolve readily in that solvent.