Miscellaneous Intelligence. 17/5 



tographs contain two very strong and abruptly-bounded blotches, 

 and a third one less marked. It is now evident that this differ- 

 ence in two parts of the lines indicates a different condition of the 

 nebula on the two sides of the star-spectra. Other lines besides 

 those described in this note are present, not only between G and 

 F, but also on the more refrangible side of the strong line about 

 A 3725.— Proc. Boy. Soc, March 20, April 16, 1890. 



2. On a neio Group of Lines in the Photographic Spectrum 

 of Sirius y by William Huggins and Mrs. Huggins, (Proc. Roy. 

 Soc, April 25.) — In 1879, the author gave an account of a series 

 of broad lines in the photographic region of the spectrum, char- 

 acteristic of Sirius, Vega, and other white stars, and which was 

 identified as a continuation of the spectrum of hydrogen beyond 

 H. In photographs taken since, the complete series of the hydro- 

 gen lines, including 6 and z, come out with great distinctness. 

 The presence of another group of broad lines was suspected some 

 distance farther on in the ultra-violet region, but until this year 

 they have not been seen in the photographs with sufficient dis- 

 tinctness for even approximate measurement. On April 4th, a 

 photograph of the spectrum of Sirius was taken with a long expo- 

 sure, the slit being made very narrow. This plate shows that the 

 spectrum of Sirius, after the termination of the hydrogen series, 

 remains, as far as can now be seen, free from any strong lines 

 until a position as far in the ultra-violet as about 1^338 is 

 reached, at which place appears the first of a group of at least six 

 lines, all nearly as broad as those of the hydrogen series. The 

 third line of the group about A 3278 appears to be the broadest, 

 but they are all broad, though even in this photograph they are 

 not seen with the distinctness which is necessary for ascertaining 

 accurately their relative character. The sixth line occurs where 

 the spectrum is faint, almost at the limit of this photograph, which 

 was taken when Sirius was some distance past the meridian, and 

 it is uncertain whether this line completes the group, or whether 

 there may not be other lines still more refrangible belonging to 

 it. The following are the wave-lengths determined, but they 

 must be regarded as only preliminary, and but roughly approxi- 

 mate measures of the positions of the new lines : 



X 3338 1 3311 ?, 3278 a 3254 ^.3226 1 3199 



Y. Miscellaneous Scientific Intelligence. 



1. American Association for the Advancement of Science. — 

 The 39th meeting of the American Association will open at 

 Indianapolis on Tuesday, the 19th of August. The meeting will 

 be the 50th anniversary of the organization of the Association of 

 Geologists and Naturalists, in whose expansion the present Asso- 

 ciation began its existence. The president for the meeting is 

 Prof. George L. Goodale, of Cambridge, Mass. 



For all matters pertaining to membership, papers and business 

 of the Association, the permanent secretary, Prof. F. W. Putnam, 

 should be addressed at Salem, Mass., up to August 15 ; and from 

 Aug. 15 to Aug. 30, the Denison House, Indianapolis. 



