was neither too fluid nor too tenacious--if its atoms were all numbered, its elements all weighed, its constituents all disposed in due relation to one another; that is to say, only if the nebula was in reality as much a system of order, which Intelligence alone could account for, as the worlds which have been developed from it. The origin of the nebula thus presents itself to reason as a problem which demands solution no less than the origin of the planets. All the properties and laws of the nebula require to be accounted for. What origin are we to give them? It must be either reason or unreason. We may go back as far as we please, but, at every step and stage of the regress we must find ourselves confronted with the same question, the same alternative--intelligent purpose or colossal chance." Now, so far as Comte is here guilty of the fallacy I have already dwelt upon of building a destructive argument upon a demonstration of mere orderly processes in nature, as distinguished from a demonstration of the natural cause of these processes, it is not for me to defend him. All we can say with regard to him in this connection is, that, having a sort of scientific presentiment that if the knowledge of his day were sufficiently advanced it would prove destructive of supernaturalism in the higher and more abstruse provinces of physical speculation, as it had previously proved in the lower and less abstruse of these provinces, Comte allowed his inferences to outrun their legitimate basis. Being necessarily ignorant of the one generating cause of orderly processes in nature, he improperly allowed himself to found conclusions on the basis of these processes alone, which could only be properly founded on the basis of their cause. But freely granting this much to Professor Flint, and the rest of his remarks in this connection will be found, in view of the altered standing of this subject, to be open to amendment. For, in the first place, no one need now resort to the illogical supposition that "the law of gravitation or any other physical law has of itself determined the course of cosmical evolution." What we may argue, and what must be conceded to us, is, that the common substratum of all physical laws was at one time sufficient to produce the simplest physical laws, and that throughout the whole course of evolution this common substratum has always been sufficient to produce the more complex laws in the ascending series of their ever-increasing number and variety. And hence it becomes obvious that the "origin of the nebula" presents a difficulty neither greater nor less than "the origin of the planets," since, "if we may go back as far as we please," we can entertain no _scientific_ doubt that we should come to a time, prior even to the nebula, when the substance of the solar system existed merely as such--_i.e._, in an almost or in a wholly undifferentiated form, the product, no doubt, of endless cycles of previous evolutions and