402 Total Eclipse of the Sun as observed at Orar, Portugal. 



beginning of totality are an interesting series. They show a long 

 series of hydrogen lines (26 beginning at h), and a large number of 

 iron and titanium lines. The difference in behaviour of these t\\<, 

 metals is shown in a striking manner, the titanium lines, like the 

 hydrogen lines, being bright in the whole series of photos, beginning 

 10 sees, before totality, while the iron lines are reversed in the 

 earlier photographs. Titanium lines at wave-lengths 3685'30, 3761-46, 

 and 3759'42 are specially bright. A reproduction is given of part of 

 this series of photographs. (Plate 4). 



The Corona Spectra. Reproductions of these spectra are given in the 

 accompanying plate (Plate 5). With the flint spectroscope a con- 

 tinuous spectrum is obtained from F to H. Eight bright lines are dis- 

 tinctly shown stretching right across the continuous spectrum, ;m<l 

 several shorter lines in the densest part. The line 1474 K is not shown, 

 probably because plates specially sensitive in the green were not used. 

 The wave-lengths of the lines have not yet been determined. The 

 positions of the corona lines are indicated on the plate and can be seen 

 in the top band, though only faintly. 



With the quartz spectroscope a continuous spectrum is shown which 

 can be faintly traced as far as X 3600. Strong bright lines are shown 

 at X 3987 and X 3801. 



