ABSTRACT
Rules of conduct and statements of ethical value are themselves conditioned by the changing nature of the material which rules of conduct seek to regulate, and statements of value to estimate. The history of philosophy presents a number of examples of perfectly logical philosophical systems, constructed by philosophers on the assumption that the nature of the Universe, like the nature of mathematics, must necessarily conform to the laws of their own reasoning. From these general principles philosophers have proceeded to deduce what the nature of the Universe must be, by means of logical laws which are themselves numbered among the principles which are intuitively apprehended by the mind to be true. Leibnitz constructed a mathematical universe on the basis of a number of homogeneous units, established by logical processes, called monads.
