ABSTRACT
This chapter presents an expression of the author's full adhesion to the view which insists upon the uniformity, not merely of nature, but also of human nature. The exact sciences move within the limits of the Uniformity of Nature and the law of Universal Causation; and their subject-matter consists of sense-phenomena, i.e. of things which, as known to science, are objects of perception to some mind. There is uniformity of human nature as well as of external nature; there are conditions under which certain actions are always performed, and without which they would never be done. As the author may admit that the laws of the exact or material sciences do not extend to mental science, without thereby forfeiting the right to subject mental phenomena to scientific investigation and analysis. Chemistry does not cease to be a science because chemical affinity cannot be exhibited as a case of the gravitation formula.
