480 



Intelligence and Miscellaneous Articles. 



We have therefore four days on which the phenomenon was com- 

 plete ; for only two positions of the spectroscope are wanting. As 

 1 remarked in the preceding note, the magnesium-lines appeared 

 brighter and broader in the regions where the flames of the chromo- 

 sphere were more pronounced and brilliant ; but I must now say that 

 the chromosphere is rather composed not of flames, but of an extraor- 

 dinary number of slender threads which resemble very fine hair. In 

 the vicinity of the north pole the chromosphere continues to be much 

 more elevated than at the south pole. 



Here is another observation which agrees with the great abun- 

 dance of magnesium, and which I had the opportunity of making 

 only yesterday : — When observing the lines h, I can see at the same 

 time a portion of the s])ectrum beyond the line E. Alter exploring 

 about one third of the margin, I perceived the leversal, in two suc- 

 cessive positions, of Kirchlioff 's line 1474 ; I then recommenced the 

 tour, and found the line 1474 reversed all round the margin in the 

 chromosphere, like the magnesium ; and I verified the same pheno- 

 menon again today : therefore the line of the corona can be distin- 

 guished everywhere in full sunshine. In the preceding months I 

 had observed this line many times, but only in the special examina- 

 tion of the spectrum of the protuberances or of the characteristic 

 lines of the margin. 



The relative intensity of the line 1474 agrees generally with that 

 of the magnesium, which corresponds with the number of reversed 

 lines of the group h. In other terms, when the magnesium-line is 

 faint, we see only the line h^ reversed ; and when it was very bright, 

 I could see all the lines 6\ IP', b^, b^ reversed. 



To give an example of the distribut^'on of these lines on the mar- 

 gm, I here relate the observations made in each position, on the 

 29th of July, 1872, between 9 and 10 a.m. : — 



o 



N. 



bH-'P 



1474 



W.90 



PPPP 



1474 



S.180 



h" 



1474 



E. 270 



bnn"^ 



1474 



6 



b'Pb^ 



1474 



96 



b'bWb^ 



1474 



186 



bWP 



1474 



276 



pp 



1474 



12 



bHH^ 



1474 



102 



b^b^' 



1474 



192 



bW-P 



1474 



282 



b^p 



1474 



18 



b^-'b^ 



1474 



108 



PPb-" 



1474 



198 



h'P 



1474 



288 







24 



mn^ 



1474 



114 



bVH^ 



1474 



204 



bW 



1474 



294 



h' 



1474 



30 



bHH'' 



1474 



120 



PPP 



1474 



210 



bH'' 



1474 



300 



b' 



1474 



36 



bHH^ 



1474 



126 



PP 



1474 



216 



bW 



1474 



306 



b^ 



1474 



42 



bH-^P 



1474 



132 



PbH^ 



1474 



222 



bW 



1474 



312 



b" 



1474 



48 



bHH-" 



1474 



138 



PPP 



1474 



228 



PP 



1474 



318 



bw 



1475 



54 



bHH^ 



1474 



144 



bH'' 



1474 



234 



P 



1474 



324 



pp 



1474 



60 



bH'^Pb' 



1474 



150 



bPP 



1474 



240 



P 



1474 



330 



pp 



1444 



66 



Pi-^Pb^ 



1444 



156 



PP 



1474 



246 



Pb"^ 



1474 



336 



pp 



1474 



72 



bH-'PP 



1474 



162 



PP 



1474 



252 



b'PP 



1474 



342 



pp 



1474 



78 



b^PP 



1474 



168 





1474 



258 



P 





348 



ppp 



1474 



84 



PPPP 



1474 



174 



Pp" 



1474 



264 



bH'' 



1474 



354 



ppp 



1474 



From the 19th to the 31st of July I observed very brilliant spec- 

 tra in some portions of the margin completely destitute of protube 

 ranees, but composed of small bright flames and corresponding to 

 numerous minute faculse, without any appearance of eruption. — 

 Comptes Rendus de V Acad, des Sciences, August 12, 1872, pp. 430, 431 . 



M 



