666 



SCIENCE 



[Vol. LVI, No. 1458 



to the flood of protest pouring in on tliem 

 against this betrayal of the Puelblo Indians for 

 the sake of a few New Mexico land-grabbers. — 

 The New Tork World. 



SPECIAL ARTICLES 



SERIES REGULARITIES IN THE ARC 

 SPECTRUM OF CHROMIUM 



The detection of two sets of related triplets, 

 by Meggei-s and Kiess, in the course of their 

 work on the arc spectrum of ehi'omium, induced 

 the present writers to undertake a more thor- 

 ough examination of the spectrum, to find, if 

 possible, other regularities which might lead to 

 series relationships. While a detailed discus- 

 sion of the work has not yet been completed, 

 enough has been found ito warrant the follow- 

 ing statements. 



At least three sets of series whose members 

 are triplets, occur in the arc spectrum of 

 chromium. Of these, two sets are composed of 

 vfide triplets, and one set of narrow triplets. 

 The wide-triplet series are parallel; that is, 

 'there exists a constant difference 'between the 

 wave numibers of homologous member's. Each 

 component of the first memiber of the diffuse 

 series is itself a narrow triplet. In the table 

 are given data for the first members of the 

 principal, sharp and diffuse series of the two 

 parallel sj-stems : 



The narrow triplets which constitute the third 

 set of series are characterized by the frequency 

 differences Av^ — 8.80 and Avg = 5.65. Sev- 

 eral doublets in which each of these separations 

 exists and also one with the separation, Av = 

 81.37, have likewise been found. These are 

 suggestive of inter-series combinations. 



C. C. Kiess 



Harriet Knudsen Kiess . 

 Washington, D. C, 

 October 10, 1922 



THE NATIONAL ACADEMY OF 

 SCIENCES 



The autumn meeting was held in New York 

 City on November 14, 15 and 16, on succes- 

 sive days at Columbia University, the Rocke- 

 feller Institute for Medical Research and the 

 United Engineering Societies Building. The 

 scientific program was as follows : 



Biographical memoir of Harmon Nortlirup 

 Morse. (By title) Ira Eemsen. 



A catalogue of bright stars, a compilatiori of all 

 the known data concerning the 9110 brightest 

 stars: Frank Schlesinger. The requirements 

 for an abstract are perliaps sufficiently complied 

 with by the title itself, but it may be well to 

 say in addition that the catalogue gives the name 

 of each star, its position for 1900, the Durehnms- 

 terung number, magnitude, spectrum, proper mo- 



