■ vapor of 



■ l-ri.ulit!,<— ran be traced beyond the 

 5 spectrum on the side which "correspo 



' ite it appears to be alums' 

 ii] is. One or 



Ihe five stronger bright groups are too faint at the commence- 

 ment and ending of each group to permit of more than a meas- 

 urement of the estim c-.\ '.riul.ii-t part of each bright space. 



The positions of these brightest parts are : 



A 4769, A 4634, A 4507, A 4412, A 425:5. 



Professor A. Herschel and Dr. von Konkoly pointed out long 

 a go that the spectra of periodic meteors l>el">u<i'ing to different 

 swarms of meteors differ from each other, and the meteorites 

 which come down to us differ greatly in their chemical constitu- 

 tor). It is not surprising to find the matter of the nucleus of this 

 comet to exhibit a chemical difference from that of other comets. 



t. PiihllrafJons oftht Washhin-j, < ')hs> rmtori/ of the University 

 of Wisconsin. 8vo. Vol. i. Madison, 1882. Edward S. Hol- 

 «en, Director.— This volume contains the description of the 



. Schseberie, and rcdim- 

 of 27 new nebuhe: a 

 Mr. Holden ; a list of 



.... OI»el '.; 



