144 



SCIENCE 



[N. S. Vol: LIII. No. 1363 



as the solvent and vulcanized rubber membranes as 

 tie septa, the members of the following pairs were 

 separated from each other by dialysis: (1) cane 

 sugar and sulphur; (2) silver nitrate and naphtha- 

 lene; (3) silver nitrate and camphor; (4) silver ni- 

 trate and sulphur; (5) cane sugar and camphor; 

 (6) cane sugar and naphthalene; (7) lithium 

 chloride and sulphur; (8) lithium chloride and 

 camphor; (9) lithium chloride and naphthalene. 

 In the case of each pair, the last named substance 

 passed through the membrane and the first named 

 remained behind in the solution in the dialyser. 

 The results are entirely in harmony with the au- 

 thor's views on osmosis as expressed in a previous 

 paper, Jour. Phys. Chem., 10, 141 (1906), and in 

 fact the results obtained were predicted by the 

 principles laid down in that paper. The work is 

 being continued. Not only have crystalloids been 

 separated from each lother by dialysis, but colloids 

 have also been thus separated from each other, and 

 colloids have been separated from crystalloids iy 

 having the colloids pass through the membrane and 

 crystalloids remain behind in the solution in the 

 dialyser. These results too are in perfect accord 

 with the principles of osmosis as expressed by the 

 author in his previous publication (1. c). 

 ' Investigations on gelatines. Decay of viscosity 

 on hydrolysis as a function of hydrogen ion concen- 

 tration: S. E. Sheppard, Felix A. Elliott, Haert 

 D. GiDEONSE and (Miss) C. M. Godben. 



I Investigations on gelatines. Protein errors of in- 

 dictors: (Miss) A. J. Benedict and Eelix A. 

 Elliott. 



Gelatine as am emulsifying agent: Harry N. 

 Holmes and W. C. Childs. Using gelatine as a 

 typical hydrated colloid excellent emulsions of ker- 

 osene-in-Tvater were made and their stability ob- 

 served. It was found that the leading factor as 

 regards stability was a definite and most favorable 

 viscosity, no matter how obtained. This viscosity 

 could be secured by using the required concentra- 

 tion of gelatine, or with more gelatine made less 

 viscous by such peptizing salts as sodium iodide, 

 or with less gelatine made more viscous by coag- 

 ulating salts of the sodium sulfate type. Lowering 

 of surface tension was a factor of somewhat less 

 importance. There was no evidence within the 

 limits of accuracy employed of the formation of 

 adsorption films at the oil-water interface. There 

 must 'have been such adsorption but it was evi- 

 dently too limited in amount to play a leading part 

 in emulsification. 



Adsorption of precipitates III: The adsorption 

 of precipitating ions hy hydrous aluminum oxide: 

 Haret B. Weiser and Edmund B. Middleton. 



The thermal decomposition of gaseous nitrogen 

 pentoxide. A mono-molecular reaction: Earring- 

 ton Daniels and Elmer Johnston. (Lantern.) 



The structure of gold amalgams: S. A. Bealet 

 and E. F. Schneider. (Lantern.) 

 , Some new methods for determining the vapor 

 pressure of hydrated salts: Egbert B. Wilson. 

 (Lantern.) 



Measuring low vapor pressures: Alan "W. C. 

 Menzies. 



Adsorption of gases hy nickel catalyst and the 

 mechanism of hydrogenation: H. S. Tatlor and 

 A. W. Gauger. 



A new form of titration hydrogen electrode: 

 Felix A. Elliott and S. F. Aceee. 



Electrometric standardizing of permanganate 

 and dichromate with hydriodic acid, and the 

 "super-oxidizing power" of dichromate: W. S. 

 Hendrixson. Potassium iodide, free from other 

 halogens and standardized with silver, was titrated 

 electrometrically in normal sulfuric acid with per- 

 manganate standardized with sodium oxalate. 

 Known solutions of potassium dichromate were 

 treated with twice their equivalent of potassium 

 iodide, and the excess of the latter titrated with 

 permanganate. The diehromates were true to 

 theory, showing no "super-oxidizing power," con- 

 trary to J. Wagner and others and in agreement 

 with G. Bruhns and others. The use of hydriodic 

 acid as a standard in oxidimetry, practical appli- 

 cations and interferences will be further studied. 



The isotopes of lithium as related to the consti- 

 tution of the nuclei of atoms: W. T>. Harkins. 

 (Lantern.) 



' The distribution of strong electrolyte between 

 benzene and water: Arthur E. Hill. 



The cryoscopy of boron trifluoride solutions: 

 system with hydrogen sulfide: A. F. O. Germann 

 and H. S. Booth. 



The dielectric constant of selenium oxy chloride : 

 James E. Wildish. 



Ion conductance of strong electrolytes: D. A. 

 McInnes. 



The independent origin of acrinium: Elliott Q. 

 Adams. 



Nephelometric estimation of sulfur and barium: 

 Lloyd K. Eigos and C. Walter Ebeblein. 



Further studies on the freezing points of the 

 nitrotoluenes : J. M. Bell, E. B. Cordon, F. H. 

 Spry and W. White. 



