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Rh one department only (viz., botany), most interested in their bearings upon its special problems, one accustomed to direct and close dealing with the tacts in hand, and disposed to rise from them only to the consideration of those general questions upon which they throw, or from which they receive, illustration." It is this characteristic which gives its eminent value to Dr. Gray's volume. On such a grave question, what we want to know is the intelligent opinion of men capable of forming an independent judgment, and a statement of the evidence on which they base their conclusions. The promulgation of Darwin's theory, in 1859, found Prof. Gray a trained student of the biological problems presented by the vegetable kingdom. With an extensive and accurate knowledge of plants, and a philosophical turn of thought which could not evade the question how the vast diversities of the plant world have been brought about, he had a solid preparation for judging of the claims of the "Origin of Species." Convinced of the total insufficiency of all previous theories upon the subject, he saw at once that Mr. Darwin's view was a great step forward in the pathway of science, resolving difficulties before insuperable, and promising to be of immense service in organizing existing knowledge, and in opening avenues of future investigation. The next year after the issue of the "Origin of Species," he published an elaborate article in the American Journal of Science, reviewing and interpreting it, and contrasting its doctrines with those advocated by Prof. Agassiz. This is the opening paper of the present volume, and was followed by a series of essays which appeared in various magazines, taking up many aspects of the subject, answering objections, elucidating obscurities, criticising adverse works, and contributing important additions to the general theory. These papers, as now printed together, not only illustrate the history of the controversy, and the progress of the discussion, but they form, perhaps, the fullest and most trustworthy exposition and illustration of what is to be properly understood by "Darwinism" that is to be found in our language. Of course, the work is not a systematic treatise upon the subject, but it covers the chief points that are of paramount interest, both to naturalists and to general readers.

But there is another feature of Dr. Gray's volume which will commend it, in even a higher degree, to large portions of the public. It gives earnest and prominent attention to the religious aspects of the question. Though a thorough-going Darwinian, Dr. Gray will not consent to hold his scientific opinions at the expense of his religious faith. Satisfied that the great principle of "Natural Selection" is a powerful working law of Nature, and holding to cardinal theological beliefs, he maintains that the conflict between them is not necessary, and that an enlightened interpretation of religious doctrine must bring it into harmony with the advanced scientific conclusions. Nor is it a mere semblance of faith that is to be harmonized with science by frittering away its essential character. Dr. Gray is out and out orthodox, and eminently sound in his theology. In his preface he says:

This portion of Dr. Gray's work is very able, and we think all candid religious readers will find it conclusive. To all those timid souls who are worried about the progress of science, and the danger that it will subvert the foundations of their faith, and who perplex themselves with the question whether a Darwinian can be a Christian, we recommend the dispassionate perusal of this volume. The subject is touched upon in various aspects in the different papers; but the last article, which is newly contributed to the volume, grapples with the gravest difficulty of the case, and is an elaborate discussion of "Evolutionary Teleology," or the doctrine of purpose and design in Nature as affected by the principle of "Natural Selection." Dr. Gray maintains with great force that, instead of being subverted