To this cause of change we give in no disrespectful spirit, the name of the "Happy Accident Theory" as opposed to Mr. Spencer's "Moving Equilibrium Theory," and would ask what it may and may not account for. It may account for much within the limits of Mr. Darwin's enquiry, but does it at all account for those fundamental facts which he takes for granted--genesis, heredity and consciousness, or the origin of the organic out of the inorganic. Could some inorganic aggregate, produced by the relations of certain chemical compounds under the action of light, heat, &c, accidentally take to generation by fission or otherwise, and then by a succession of sports eventuate in sexual generation? Could such a chemical combination accidentally become conscious, and by a succession of sports organise its consciousness into purpose? Into these regions we think we cannot carry the Happy Accident Theory--the theory of sports. This is a valid and justifiable theory within the limits of biology, though even here the estimate of its results may be exaggerated; but beyond it and behind those limits it is of no use. The very admission of it is a confession of ignorance and incapacity to apprehend the exact line of causation; but so long as we are satisfied that the accident or the sport which gives rise to a variety, occurs within the scope of factors which we are able to recognise, the incapacity to account for the special cause of a special sport does not affect the general theory. But if any one should rashly extend the application of the theory so as to explain the otherwise unaccountable presence of a new factor, or advance it as an explanation of a line of sequences not logically deducible from all that is included in the mental appraisement of the original factors by which the system of sequences is to be unified, then he makes a very great mistake indeed. It is to guard against such a mistake that we take notice of the proper limits to the applicability of Mr. Darwin's theory. Indeed we think it is too commonly supposed that Mr. Darwin's theory is of the universalistic scope of Mr. Spencer's theories; his work however is purely of a scientific character relating to the province of Biology. It will have been noticed that in the preceding argument we have not dealt with the philosophical problem of the theory of knowledge. We have simply taken the study of the cosmos in the historical order, finding the inorganic as antecedent to the organic, the unconscious to the conscious, a historical order which cannot be disputed whatever theory of knowledge may be held.