[19]: The truth or falsity of "Evolution" depends entirely on the successful solution of this problem, for the chances are quintillions to ones that no two identical forms could have originated from different centres, or from the same centre on divergent lines, and ever reached identically the same results. And how any two forms should happen to be sexually paired, on the same or different lines of divergence, is one of those inexplicable mysteries which must puzzle Herbert Spencer in all his labyrinthian searches into "Force-correlation," "Differentiation," "the Dynamic Force of Molecules," etc., etc. However successful he may be in other directions, he will inevitably fail in this. We must fall back on the grand Old Bible genesis for the solution of this difficulty, where every living thing was commanded to produce seed, or multiply and replenish the waters and the earth with offspring. [20]: These transcendental or ideal forms may be said to correspond to the "spiritual essences" of Plato. They are the eternal, immutable principles which are discernible to the eye of the soul, as the sensible objects they represent are discernible to the eye of the body. Modern metaphysics may deem them mere abstractions, but a higher realistic philosophy will treat them as substantive forms, of which the objective reality is but the shadow. [21]: Herbert Spencer may be quoted as authority on this point. He says: "There is invariably, and necessarily, a conformity between the vital functions of any organism, and the _conditions_ in which it is placed ... We find that every animal is limited to a certain range of climate; every plant to certain zones of latitude and elevation." And the same law holds good as to the marine fauna and flora, each specific form being confined to its own sea-depth, or distance north or south from the thermal equator. [22]: Speaking of the ultimate principles or elements of matter, Plato is quoted by Humboldt as exclaiming with modest diffidence, "God alone, and those whom he loves among men, know what they are." It is only those who seek to eliminate God from the universe that speak with confident flippancy on the subject of molecular machinery and force-correlations. [23]: As long as the evolutionists cannot agree among themselves as to what constitutes the process of evolution, it can hardly be expected that the public will accept their speculations as conclusive inductions. Professor Bastian, who strongly commits himself to the doctrine, thinks the word "evolution" arbitrary and open to many objections, while Mr. Herbert Spencer says;--"The antithetical word Involution would much more truly express the nature of the process."