79 
and all social movements. It is admitted that to include 
Mental Evolution in the sweep of this all -comprehending law 
will startle, but it is contended that there is no help for it. 
In order to strengthen the argument, the attempt is made to 
show that all this is a necessary corollary from the Per- 
sistence of Force. It is here that Mr. Spencer^s reasoning, 
quoted on pages 14 and 15 of the foregoing Paper, occurs. 
Manifestly, then, his whole argument, the continuity of his 
Philosophy, depends on his showing that the one Law, the 
Persistence of Force,^^ — of the Solar Force, — can account 
for all the things to be found in Man, in his Mind, Will, 
Feelings, Conscience. 
We have shown the unwarranted leap he is compelled to 
make in order to arrive at this result. Evidently, therefore, 
his system, which ought to be a unity, is here broken up into 
two contradictory fragments. He next shows that the motion 
generated by the Solar Force always follows the line of least 
resistance; and out of the working of this law he explains 
many hundreds of facts in Astronomy, Geology, Organic 
Growth, Mental Evolution, Political Economy. The con- 
ception of Evolution thus gained is then carried on through 
several chapters; and it is shown that, on this principle, many 
thousands of known facts in all the Sciences, in Art, in 
History, can be accounted for. From the working of this 
law it is shown that large Homogeneous masses would 
result ; which, being very unstable, would have a great 
tendency to break up, or be evolved into the Hetero- 
geneous^^; the results whereof would be the ^^Multiplication 
of Effects,^^ the Differentiation and Segregation^^ of 
Individuals,^^ and the general development of a highly 
individualised and specialised type. This Individuality,^^ 
it is shown, would grow, in speciality and perfectness, until 
its final consummation or Equilibration was gained, after 
which the process of Dissolution would begin. This 
great law, the ^^Instability of the Homogeneous,^^ is thus 
shown to be capable of accounting for some of the greatest, 
deepest, most complex, and most remarkable of all the move- 
ments that have gone on in our race. 
Thus, from the first patch of star- dust to the full-orbed 
completeness of our nineteenth century life, the system 
attempts to make one broad logical road ! 
The argument it makes for Evolution is this : — If Evolution 
be not true, it is passing strange that millions of facts are 
explained by it. A true key of the universe must fit the 
universe; when, therefore, a key does fit so often, the pre- 
sumption is that it is the true one. 
