Progress is symbolized in the clock, the balance and the foot-rule.
Paraphrasis of the foregoing implies that if we can time, weigh and measure, facts in lieu of theories could be submitted. Science, whose aim is to understand nature, must set out with the assurance that nature is understandable. Then, unless it be out of relation with things, must it still be bound up with other phenomena which do work upon our senses or our instruments. Thus it must sooner or later become perceptible to us.