e 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

_A._ In your reading, notice how often the effects are indicated by the
use of some one of the following expressions: _as a result, accordingly,
consequently, for, hence, so, so that, thus._

_B._ Which sentences state causes and which state effects in the following
paragraphs?

1. The power of water to dissolve most minerals increases with its
temperature and the amount of gases it contains. Percolating water at
great depths, therefore, generally dissolves more mineral matter than it
can hold in solution when it reaches the surface, where it cools, and,
being relieved of pressure, much of its carbonic acid gas escapes to the
atmosphere or is absorbed by aquatic plants or mosses. Hence, deep-seated
springs are usually surrounded by a deposit of the minerals with which the
water is impregnated. Sometimes this deposit may even form large hills;
sometimes it forms a mound around the spring, over the sides of which the
water falls, while the spray, evaporating from surrounding objects, leaves
them also incrusted with a mineral deposit. Percolating water evaporating
on the sides and roof of limestone caverns, leaves the walls incrusted
with carbonate of lime in