Besides, you are endeavouring to deduce power from mass, in which you
expressly say there is no power but the _vis inertiae_: whereas, the whole
analogy of chemistry proves that power produces mass.
* * * * *
The use of a theory in the real sciences is to help the investigator to a
complete view of all the hitherto discovered facts relating to the science
in question; it is a collected view, [Greek: the_orhia], of all he yet
knows in _one_. Of course, whilst any pertinent facts remain unknown, no
theory can be exactly true, because every new fact must necessarily, to a
greater or less degree, displace the relation of all the others. A theory,
therefore, only helps investigation; it cannot invent or discover. The only
true theories are those of geometry, because in geometry all the premisses
are true and unalterable. But, to suppose that, in our present exceedingly
imperfect acquaintance with the facts, any theory in chemistry or geology
is altogether accurate, is absurd:--it cannot be true.
Mr. Lyell's system of geology is just half the truth, and no more. He
affirms a great deal that is true, and he denies a great deal which is
equally true; which is the general characteristic of all systems not
embracing the whole truth.
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