causes or its effects. A cause may be stated and the effects given or the
effects may be made the topic statement for which we account by giving its
causes.

The importance of the relation of cause and effect to scientific study is
discussed in the following paragraph from Mill:--


The relation of cause and effect is the fundamental law of nature. There
is no recorded instance of an effect appearing without a previous cause,
or of a cause acting without producing its full effect. Every change in
nature is the effect of some previous change and the cause of some change
to follow; just as the movement of each carriage near the middle of a long
train is a result of the movement of the one in front and a precursor
of the movement of the one behind. Facts or effects are to be seen
everywhere, but causes have usually to be sought for. It is the function
of science or organized knowledge to observe all effects, or phenomena,
and to seek for their causes. This twofold purpose gives richness and
dignity to science. The observation and classifying of facts soon become
wearisome to all but the specialist actually engaged in the work. But when
reasons are assigned, and classification explained, when the number of
causes is reduced and the effects begin to crystallize into essential and
clearly related parts of one whole, every intelligent student finds
interest, and many, more fortunate, even fascination in the study.

--Mill: _The Realm of Nature_. (Copyright, 1892, by Charles Scribner's
Sons.)


EXERCISES