Formulae are the anaethetics of thought, not its stimulants.

The whole object of science is to synthesize, and so simplify; and did we but know the uttermost of a subject we could make it singularly clear.

That Mars is inhabited by beings of some sort or other we may consider as certain as it is uncertain what these beings may be.

Are physical forces alone at work there, or has evolution begotten something more complex, something not unakin to what we know on Earth as life?