50 



SCIENCE 



[N. S. Vol. L. No. 1280 



C being a constant, individual for each liquid; be- 

 ing taken at 8.7 for water and m at 18 the last 

 equation yields 



rx = 



, (pxiJx - S.7) = 12.1(px!'x - 8.7). 



Since we calculate from tables of properties of 

 saturated vapor of water that pvat 273° absolute 

 amounts to 31 calories per kilogram the above equa- 

 tion for Tx gives 



12.1 (31-8.7) =270° absolute 



at 313 degrees at which pv is 34.6 cals. we find 

 12.1 (34.6-8.7) =313.3° absolute. 



At 473 degrees absolute pv is equal 47.9 calories 



and 



12.1 (47.9-8.7) =473.5° absolute. 



Similar agreement is found for other vapors by 

 inserting the correct valve for constant as long as 

 no psolymerisation in the liquid takes place. 



(1) Molecular state of water vapor; (2) Vapor 

 pressure depression equation for dilute aqueous so- 

 lutions: James Kendall. 



Size and behavior of suspended smoTce particles: 

 E. E. Wilson. 



Influence exerted hy antagonistic electrolytes on 

 the electrical resistance and permeability of emul- 

 sin membranes: G. H. A. Clowes. 



The exact determination of molecular weights 

 by the boiling point method: E. M. Washbtjrn. 



Solubility of strontium nitrate m anhydrous 

 alcohol in alcohol containing small per cent, of 

 water: C. W. Eoulk. 



(1) Influence of the age of ferric arsenate on 

 its peptization; (2) Syneresis of silicic acids gels: 

 H. N. Holmes. 



A study of the lowering of vapor pressure of 

 water produced by absorbed KCl: B. F. Lovelace, 

 J. C. W. Frazer, V. B. Sease. 



A study of the lowering of vapor pressure of 

 water produced by absm-bed mannite: J. C. W. 

 Eraser, B. F. Lovelace, T. H. Eogers. 



The volume and surface of the pores in charcoal 

 and the compression of adsorbed substances: W. 

 D. Harkins and D. T. Ewing. 



An electromagnetic and valence hypothesis of 

 heterogeneous equilibrium in adsorption: W. D. 

 Haekins. 



division of water, sewerage and sanitation 



Eobert Spurr Weston, Chairman 



W. W. Skinner, Secretary 



Determination of bromid in mineral waters and 



brines: W. W. Skinner and W. F. Baughman. 



Colorimetrie methods for the determination of 

 bromin give satisfactory results only when small 

 quantities of bromin are to be determined. The 

 method proposed for the determination of bromids 

 in the presence of chlorids is the oxidation of the 

 bromids and removal of the liberated bromid by 

 steam distillation or by aspiration. The method 

 depends upon the use of chromic acid for oxidation 

 of the bromid. Chromic acid in concentrated solu- 

 tion liberates bromin from bromids quantitatively 

 at room temperature and the bromin may be re- 

 moved by aspiration. It liberates only a trace of 

 chlorin from chlorids, forming probably chromic 

 chlorid which remains in solution. When chromic 

 acid acts on a solution of chlorids and bromids, 

 some chlor-bromid is formed which is removed 

 with the bromin by aspiration. The liberated 

 bromin and the chlorin in the first aspiration is 

 collected in a solution of sodium sulphite and 

 sodium carbonate, which is evaporated to dryness 

 and again submitted to the treatment with chromic 

 acid and aspirated the second time. The double 

 aspiration gives very accurate results. 



Certain war gases and health: Charles Baskee- 

 viLLE. Evidence has been collected from all the 

 chlorine producing plants and many works and ar- 

 senals where chlorine was used. Preponderating 

 evidence favors the conclusion that chlorine exerts 

 a preventative influence against influenza. The 

 evidence is not conclusive, however, as contrary 

 data were obtained from some plants. The con- 

 tradictions may possibly be harmonized on the 

 basis of concentration, the more dilute up to limits 

 the more effective. Small amounts of bromine in 

 the air appear to prevent influenza completely. 



Chaeles L. Parsons, 



Secretary 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK. N. Y. 



Entered in the poat-«£cc at Lancaster, Pa., at Kcond dan matter 



