ABSTRACTS OF TECHNICAL PAPERS ■ 155 



The Adsorption of Gases by Solids with Special Reference to the 

 Adsorption of Carbon Dioxide.^ H. H. Lowry and P. S. Olmstead. 

 This paper presents a theory of adsorption and its mathematical 

 development, which is similar to but differs somewhat from that of 

 Polanyi. A detailed description is included of a relatively convenient 

 method of application of the theory to experimental data. Using this 

 procedure, a test of the theory has been made on the data obtained by 

 Homfray, Titoff, Richardson, Chappuis and S. O. Morgan for the 

 adsorption of carbon dioxide by charcoal. The very satisfactory 

 agreement obtained between experiment and theory gives support to 

 the fundamental assumptions underlying the theory. 



The Densities of Coexisting Liquid and Gaseous Carbon Dioxide and 

 the Solubility of Water in Liquid Carbon Dioxide.'^ H. H. Lowry and 

 W. R. Erickson. The densities of coexistent liquid and gaseous 

 carbon dioxide are measured over the temperature range — 5.8 to 22.9° 

 and it is shown that they can be satisfactorily represented by equations 

 involving the first and one third powers of the temperature on the 

 critical scale. The data are shown to be in substantial agreement 

 with those of other observers. It is also shown that the density of 

 saturated carbon dioxide vapor is the same within the experimental 

 error in the presence or absence of water, from which it is concluded 

 that the solubility of water in liquid carbon dioxide is less than about 

 0.005 per cent by weight over the temperature range of the investi- 

 gation. Attention is called to qualitative evidence of the formation 

 of a solid hydrate of carbon dioxide at about 4°. 



Atomic Grouping in Permalloy.^ L. W. McKeehan. This is a 

 theoretical paper which follows a long series of experimental papers. 

 In a solid solution of two metals, e.g., in the solid solution of nickel and 

 iron known as permalloy, the atoms of both kinds occupy in each 

 crystal the points of a single space-lattice. It is important to know 

 whether the points so occupied by atoms of a single kind are located 

 at random or have some regularity of arrangement. If the latter is 

 the case, it may be asked further whether the regularity is due to the 

 frequent occurrence of definite groupings of unlike atoms or merely 

 to a tendency for atoms of one kind to separate from each other as 

 widely as possible. The magnetic properties of permalloy are here 

 taken to show that the last-mentioned possibiUty is probably nearest 



^ Journal of Physical Chemistry, Vol. 31, pp. 1601-1626, November, 1927. 

 * Journal oj the American Chemical Society, Vol. 49, pp. 2729-2734, November, 

 1927. 



5 Jl. Franklin Inst., 204, 501-524 (1927). 



