It was natural that, as soon as science had attained such generalizations, the need of a synthetic philosophy should be felt; a philosophy which, no longer discussing "the essence of things," first causes," the " aim of life," and similar symbolic expressions, and repudiating all sorts of anthropomorphism (the endowment of natural phenomena with human characteristics), should be a digest and unification of all our knowledge; a philosophy which, proceeding from the simple to the complex, would furnish a key to the understanding of all nature, in its entirety, and, through that, indicate to us the lines of further research and the means of discovering new, yet unknown, correlations (so-called laws), while at the same time it would inspire us with confidence in the correctness of our conclusions, however much they may differ from current superstitions. Such attempts at a constructive synthetic philosophy were made several times during the nineteenth...