1881.] On the Iron Lines widened in Solar Sjwts. 



349 



The iron lines 

 indicating motion. 



Iron lines, visible in the same 

 field of view, steady. 



Dec. 24, 1880. . 5403 

 5404 

 5409 

 5408 



539G 

 5370 

 5369 



4919 

 4918 



5142 

 5138 



In another part of the same spot- 



•8 

 ■5 



5269 

 5268 



Jan. 1, 1881 . . . 5323 

 5327 



Jan. 6, 1881. ..4919 

 4918 



(double) . 



8 

 



5410 -0 

 5414 -5 



5366 -5 



4923 -0 



5269 '8 

 5268 -5 



5323 '5 



5327*0 (double). 



5269 "8 

 5268 -5 



4923 '5 



* All lines between \ 5323 "5 and 5410 "0 except 5382 1. 



It is to be noted, that these observations furnish us wilh an instance 

 of inversion similar to those frequently obtained in our observations 

 of the most widened lines in spots. 



The inferences to be drawn from these observations, and those on 

 which we are now continuously engaged, must be matter for future 

 communication. But I cannot resist calling- attention to the crucial 

 nature of the evidence, at least as regards iron, in favour of the view 

 first put forward by Sir B. Brodie, whom we have so recently lost, 

 that the constituents of our terrestrial elements exist in independent 

 forms in the sun.f 



I have thought it right to send in a record of this work at once, 

 with a view to induce other observers to follow the continually vary- 

 ing phases of the spots during the approaching maximum. 



The observations have been made by Mr. H. A. Lawrance, and con- 

 firmed by myself in the majority of cases. 



* In this spot the D lines indicated motion and did not retain their parallelism. 

 f Lecture delivered before the Chemical Society, June 6, 1867. 



