Chemistry and Physics 41 



No. 210. JONES, HARRY C, with E. J. SHAEFFER, E. P. WIGHTMAN, P. B. DAVIS, 

 L. D. SMITH, M. G. PAULUS, J. B. WIESEL, A. HOLMES, H. HUGHES, 

 and W. S. PUTNAM as collaborators. The Absorption Spectra of Solu- 

 tions as Studied by means of the Radio-micrometer. The Conductivi- 

 ties, Dissociations, and Viscosities of Solutions of Electrolytes in Aque- 

 ous, Non-aqueous, and Mixed Solvents. Octavo, 202 pages, 1 plate, 

 58 text figures. Published 1915. Price $1.75. 



In the investigations recorded in the above-named publication it was found that 

 solutions of non-hydrated salts are equally absorbent with pure water, except at 

 the bottoms of the bands where the solutions are more opaque. Solutions of hy- 

 drated salts are more transparent than pure water, showing that combined water 

 has less absorption than free water. This is regarded as strong evidence in favor 

 of the solvate theory of solution. 



The work in mixed solvents, the earlier results of which have already been 

 published in Nos. 80 and 180 of this series, has been extended. An elaborate study 

 has been made of a few salts in binary mixtures of ethyl alcohol and water, of 

 acetone and water and in ternary mixtures of acetone, glycerol, and water, and 

 the results are recorded in this monograph. 



No. 230. JONES, HARRY C., with P. B. DAVIS, W. S. PUTNAM, E. J. SHAEFFER, M. 

 G. PAULUS, J. F. HUTCHINSON, J. E. L. HOLMES, G. C. CONNOLLY, H. 

 H. LLOYD, J. B. WIESEL, C. WATKINS, G. F. ORDEMAN, A. G. McCALL, 

 F. M. HILDEBRANDT, F. S. HOLMES, E. S. JOHNSTON, and S. F. TRELEASE 

 as collaborators. Conductivities and Viscosities in Pure and in Mixed 

 Solvents: Radiometric Measurements of the lonization Constants of 

 Indicators. Octavo, vii-f-175 pages, 3 plates, 21 text figures. Published 

 1915. Price $2.00. 



The viscosities of solutions of caesium salts in mixed solvents and in mixtures of 

 the associated liquids, water, formic acid, and acetic acid were studied in their 

 bearing on the theory of viscosity proposed by the principal author some years ago. 

 The dissociation of salts in formamid was measured in connection with the relation 

 between the dissociating power of solvents and their dielectric constants. 



The relative chemical activity of free and of combined water was investigated 

 in connection with the velocities with which they saponified an ester and hydrated 

 acetic anhydride. The conductivities of a number of the more common organic 

 aci !s in ethyl alcohol and in several of the less common salts in water were 

 measured. It was found that combined water probably had less dissociating power 

 than free water. The absorption and adsorption of potassium chloride by soils are 

 of both scientific and technical importance. Potassium chloride is partly absorbed 

 or combined chemically with the soil particles and partly adsorbed or in a state of 

 physical union with the particles of the soil. 



No. 260. DAVIS, PAUL B. Studies on Solution in its Relation to Light Absorption, 

 Conductivity, Viscosity, and Hydrolysis: A report upon a number of 

 experimental investigations carried out in the laboratory of the late 

 Prof. Harry C. Jones by G. C. Connolly, P. B. Davis, E. O. Hulbert, 

 J. F. Hutchinson, H. I. Johnson, H. H. Lloyd, B. F. Ordeman, and 

 A. M. Pardee. Octavo, 144 pages, 26 figures. Published 1918. Price $2.00. 

 The absorption coefficient for monochromatic radiation of a number of inor- 

 ganic salts in water and in several of the alcohols was determined by measure- 

 ments on a series of solutions varying in concentration from saturation to ex- 

 treme dilution. From this data the absorption curves for each concentration were 

 drawn and the molecular absorption coefficient was calculated for each salt in the 

 various solvents. It was found that in general this coefficient is not a constant, 

 but varies with the concentration. The bearing of this deviation from a constant 

 on the question of solvation is discussed. 



Measurements of the viscosities of caesium salts have been extended to so- 

 lutions in mixed solvents containing glycerol. The work on the conductivity and 

 viscosity of salts in formamid as a solvent has been completed with the study 

 of a series of (1) salts with a common anion and (2) salts with a common cation. 



