PREFACE AND INTRODUCTION 
THis small volume makes public a new 
Theory. At the outset it is most important 
to make clear that no attempt is made to 
prove the Theory. For this reason it would 
have been better perhaps to have called it 
a New Hypothesis. Nevertheless, although 
proof is not attempted, the numerous ex- 
amples mentioned for purposes of illustration 
are, in themselves, facts which the Theory 
correlates, and therefore to some extent put 
the Theory to test. 
One reason why proof is not attempted, 
is that many and important observations 
which would best test the Theory, have 
either not been made or records of them have 
not been found. So much is this the case, 
that one of the chief reasons in bringing for- 
ward the Theory is to stimulate such research. 
Another reason is that it supports Charles 
Darwin’s Causo-mechanical Theory of the 
Origin of Species. A weak part in this great 
Theory is and always has been the subsidiary 
