44 SOLAR DAYS AND SOLAR NIGHTS. 



next in succession, that the vegetative principle of 

 the one, and the vital principle of the other, were 

 both destroyed ? 



Agassiz states that with respect to the fishes of 

 the tertiary epoch, " I have not yet found a single 

 species which was perfectly identical with any 

 marine existing fish except the little species which 

 is found in nodules of clay of unknown geological 

 age in Greenland." 



64. If an economy obtains in the sidereal uni- 

 verse of Astral Days and Astral Nights, then, since 

 the dawn of this our Solar Day, have six thousand 

 years not yet passed away ; or have six thousand 

 years not yet passed away since " darkness brooded 

 o'er the deep," and God said " Let there be light, 

 and there was light " ? 



ON THE ALTERATION IN THE POSITION 

 OF STRATIFIED ROCKS. 



65. What has been the cause of the alteration that 

 has taken place in the position of the earth's strata 

 from that which was originally horizontal to that 

 which is vertical ; or, if not, to a position more or 

 less inclined to the horizon ? As the igneous rocks 



