PRIMARY STRATIFIED ROCKS. 57 
It may be said we have no right to deny the 
possible existence of life and organization upon 
the surface, or in the interior of our planet, 
under a state of igneous fusion. *' Who," says 
the ingenious and speculative Tucker, (Light of 
Nature, book iii. chap. 10), '* can reckon up all 
the varieties that infinite wisdom can contrive^, 
or show the impossibility of organizations dissi- 
milar to any within our experience ? Who 
knows what cavities lie within the earth, or 
what living creatures they may contain, endued 
with senses unknown to us, to whom the streams 
of magnetism may serve instead of light, and 
those of electricity affect them as sensibly a& 
sounds and odours affect us? Why should we 
pronounce it impossible that there should be 
bodies formed to endure the burning sun, to 
whom fire may be the natural element, whose 
bones and muscles are composed of fixed earth, 
their blood and juices of molten metals? Or 
others made to live in the frozen regions of 
Saturn, having their circulation carried on by 
fluids more subtle than the highest rectified 
spirits raised by chemistry ?" 
It is not for us to meet questions of this kind 
by dogmatizing as to possible existences, or to 
presume to speculate on the bounds which crea- 
tive Power may have been pleased to impose on 
its own operations. We can only assert, that as 
the laws that now regulate the movements and 
