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26r tion which had been slowly driven up by expansion was found :to contain a: diminished amount of material in solution, often a very notably diminished amount, and in two or three instances practically none.
The author proposes the term apantlesis to signify this draining away of some of the molecules of the solvent undergoing expansion from those of the colloid solid in solution.
W.H. G, ACrlON OF (~'AI~.BON TETItA-CIILOII.IDE ON OXIDES. ~. Demarc;ay (Comfl. Remhts, 10.4., I11), and Lothar Meyer (ger/. ])'er., 20, 68I), independently.
.... The preparation of metallic chlorides by the action of chlorine on a heated mixture of the oxide and charcoal, leaves nothing tobe desired, if the chloride is readily w)latilized, but if it is not, there is often difficulty in separating it frmn the mixture of charcoal or oxide if an excess of either has been employed. The reaction of the oxides with carbon tetra-chloride would avoid fl~is inconvenience. The authors' results agree in the main ; when the reaction occurs, the gaseous products are carbon di-oxide, carbonyl chloride, chlorine, hexachlorethane, and according to Meyer, carbon mon-oxide. Both axree that aluminium oxide i~ readily reduced and that silica is not. Meyer states that the oxides of heryllium, magnesium and cerium are reduced, while titanium, boron and zirconium oxides are not. Demar~;ay reduced, in addition, chromium, tantatium and niobium oxides, and states that zirconium oxide is reduced slowly and titanium oxide rapidly at 44 oΒ°. Meyer does not ~ive the temperature.
W.H.G.
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