250 THE CHEMISTRY OF THE SUN. [CHAP. 



accompanying woodcut, Fig. 95, will show ; a perfect continuity 

 exists between the old facts and the new ; the stars arrange 

 themselves along the same line as do our terrestrial heat sources. 

 The wide departure of stars hotter presumably than the sun 

 (taking the absorption of the rhythmic series of lines, as 

 the indication of temperature) from the solar type shows that 

 there is much more work to be done in this field. The success 

 of my former prediction emboldens me to make another one. 



FIG. 95. The changes in the spectrum of Calcium from the Bunsen flame to 



Sirius. 



It will in all probability be found that the remaining thick lines in 

 stars of the Sirius type are represented in many cases ly the lines 

 brightened in solar prominences. 



2. Lines in the spectra of two or more substances. 



We have now to point out another direction on which the 

 discussion of the hypothetical furnaces seemed to throw some 

 light. The next conclusion was quite unexpected. Let us take 

 the conditions represented in Fig. 87, and remember that in almost 

 all cases the strongest line in a spectrum at any one temperature 



