TOTAL ECLIPSE OF THE SUN, JANUAEY 22, 1898. 
205 
Table showing the Probable Presence or Absence of some of the Chemical Elements 
in the Chromosphere— continued. 
Element. 
AVhether any of the 
strongest arc lines are 
represented in the 
chromospheric spectuim. 
Whether any of the 
enhanced lines are 
represented in the 
chromospheric spectrum. 
Ruthenium .... 
No 
Doubtful 
Scanrlium .... 
Yes 
Enhanced lines not investigated 
Selenium .... 
No arc record 
Enhanced lines not investigated 
Silicon. 
No 
Doubtful 
Silver. 
No 
Not investigated 
Sodium. 
Yes 
No enhanced lines to compare 
Strontium .... 
Yes 
Yes 
Tantalum .... 
Doubtful 
No enhanced lines to compare 
Tellurium .... 
No arc record 
Not investigated 
Thallium .... 
No 
Doubtful 
Thorium. 
No 
Not investigated 
Tin. 
No 
Doubtful 
Titanium .... 
Yes 
Yes 
Tungsten .... 
No 
Doubtful 
Uranium .... 
No arc record 
Not investigated 
Vanadium .... 
Doubtful 
Yes 
Yttrium. 
No 
Doubtful 
Zinc. 
No 
Doubtful 
Zirconium .... 
No 
Doubtful 
The word “ doubtful ” signities that though some of the lines agree ap-proximately 
in position with chromos})heric lines, there is considerable doubt as to whether such 
lines are really due to the presence of the element in question in the chromosphere. 
In the tables, coincidences with enhanced lines are indicated by the prefix p, signifying 
the presence of the corres])onding “ proto-metal ” ; thus p Ti indicates a coincidence 
with an enhanced line of titanium. 
The Spectrum of the Corona. 
Differentiation of Coronal Rings. 
One of the chief results which, in my opinion, would be secured by the use of the 
prismatic camera in eclipse work was the difierentiation between chromospheiic and 
coronal phenomena. Tlie photographs taken during the eclipses of 18113, 1896, and 
1898 all enabled this distinction to be made very clearly, and various radiations 
formerly attributed to the corona have been shown to belong to the chromosphere 
alone. The photographs taken in Africa in 1893 showed eight rings in the spectrum 
of the corona; in Novaya Zemlya, in 1896, with a less jxjwerful instrument, a 
smaller number was secured ; hut those taken with increased dispersion in India, in 
1898, show a much greate]’ number. 
