SUBSTANCES COMPOSING THE SUN. 45 



Lockyer, so far as completed up to November, 

 1877, by means of the spectroscope : 



" Sodium, iron, calcium, magnesium, chromium, 

 nickel, barium, zinc, cobalt, hydrogen, manganese, 

 titanium, aluminium, strontium, lead, cadmium, ce- 

 rium, uranium, potassium, vanadium, palladium, 

 and molybdenum." 



He says that " the existence of carbon, silicium, 

 thallium, chlorine, bromine, and iodine, though not 

 distinctly confirmed, is probable ; " and adds that, 

 "out of the fifty-nine metals found on the earth, 

 thirty-one are known with more or less certainty 

 in the sun." Professor Proctor says : " The exist- 

 ence of iron in the solar orb suggests the similar 

 use of this metal in arts and manufactories as has 

 been made in the progress of human civilization." 



Discoveries of similar elementary substances in 

 our sun and in other stellar suns render it not im- 

 probable that all the solar systems are constituted 

 like our own, with similar molecules and similar 

 inhabitants, governed by similar material and me- 

 chanical laws, and confirm the existence of analo- 

 gies between celestial and terrestrial phenomena. 



