386 SCIENCE PROGRESS 



elusion, which is of course not traversed by Kriiger's considera- 

 tions, appears to be quite valid. 



On the whole, Kriiger's view serves to bring the behaviour 

 of monatomic and diatomic gases into very much closer relation 

 and accord than had hitherto been the case. Considerable 

 experimental work is still necessary, however, before we can 

 decide between the theory of rotations and the theory of 

 precessional vibrations in polyatomic molecules. 



References to Papers on Other Subjects 



A Contribution to the Theory of Solution, E. J. Hartung, Trans. Far. Soc. 12, 66, 

 191 7. Deals with measurements on liquid mixtures, i.e. density, heat capacity, 

 and heat changes. The data are very valuable. 



The Effect of Pressure on the Equilibrium Constant of a Reaction in a Dilute 

 Solution, W. C. McC. Lewis, ibid. 12, 314, 19 17. Particular attention may be 

 drawn to the discussion on this paper, especially the contribution by J. Rice. 



Solvent Effect and Beer's Law, A. W. Stewart and R. Wright, Journ. Chem. Soc. 

 Ill, 183, 1917. 



The Le Chatelier-Braun Principle, Lord Rayleigh, ibid. Ill, 250, 1917. 



The Effect of Freezing upon certain Inorganic Hydrogels, H. W. Foote and 

 B. Saxton, Journ. Amer. Chem. Soc. 38, 588, 1916; ibid. 39, 1103, 1917. 



The Influence of various Gases on the Photo-electric Effect in Potassium, G. 

 Wiedmann, Verh. Deutsch.Phys. Ges. 18, 333, 1916. Shows that the presence 

 of hydrogen gas is essential to the production of the selective effect. 



Electrode Potentials of Tin and Lead, A. A. Noyes and Kebe Toabe, Journ. Amer. 

 Chem. Soc. 39, 1537, 1917. The relative potentials are determined from 

 measurement of the equilibrium point of the reaction between lead, tin and 

 the perchlorates of these metals. 



INORGANIC CHEMISTRY. By C. Scott Garrett, D.Sc 



Since our last report the shrinkage in volume of the papers 

 published recording work in the sphere of inorganic chemistry 

 has become more pronounced than ever. This tendency has 

 been observable during the whole course of the war, and now 

 that the ranks of the Allies have been swelled by the adhesion 

 of the United States of America, practically the only out- 

 standing scientific nation, we may expect a still further diminu- 

 tion in the volume of research being published. Scientific 

 workers have perforce turned their labours to matters of more 

 immediate practical and national importance, and the results 

 of these labours, while they are very valuable in themselves, 

 do not usually mark steps in the advance of general scientific 

 theory, and are not as a rule incorporated in scientific literature. 

 Indications of the trend of such work are to be obtained from 



