ABSTRACT
Particular attention is given to the constants of nature which have emerged in physics, as the most fundamental examples and manifestations of constancy in nature and as the ultimate foundation and expression of its laws. This chapter examines some of these cases and attempt to demonstrate thereby that each case silently invokes, and in a particular way, a central idea which unifies them and which stems from the primitive notion of constancy. The direct correspondence between thinking about nature, and experimentation, must be recognized and emphasized as the ultimate instrument of biological theory. The concept of natural law which is invoked in the search for such propositions is indeed pre-conceived, and is a particular but significant example of the notion of constancy entrenched in our minds. Accordingly, a natural law usually asserts a constant and thus immutable relationship between a set of observables.
