We have been provoked into this comparison by the evident glee with which Ik Marvel parades the results of his agricultural labors. So earnest is he to show that a man of genius can make money by farming, that he is inclined to overlook the distinction between the work of an ordinary and that of an extraordinary mind. Waiving this consideration, we have nothing to object to his ten years' seclusion from literature. That seclusion has brought him into contact with the rough realities of a farmer's life, has enabled him personally to inspect every process of agriculture, and furnish his mind with an entirely new class of facts. The result is a book whose merit can hardly be overpraised. It should be in every farmer's library, as a volume full of practical advice to aid his daily work, and full of ennobling suggestions to lift his calling into a kind of epic dignity. As a book for the generality of readers, it far exceeds any previous work of the author in force, naturalness, and beauty, in vividness of description and richness of style, and in that indefinable element of genius which envelops the most prosaic details in an atmosphere of refinement and grace. _Methods of Study in Natural History_. By L. AGASSIZ. Boston: Ticknor & Fields. 12mo. A work from the scientific storehouse of Professor Agassiz needs only to have attention called to its existence to command universal welcome. The readers of the "Atlantic" are already in some measure familiar with its contents, being a reprint of a series of papers published in this journal; but they will be read again with double satisfaction in this continuous form. The avowed purpose is "to give some general hints to young students as to the methods by which scientific truth has been reached." There are many lovers of Nature, and many students of Nature; but there are very few whom we may term philosophers of Nature. In other words, there are those who are charmed with the external world, its landscapes, its beauteous forms and tints, and all its various adaptations to fascinate the senses,--and those who delight in deciphering and describing all the details of individual objects, and their wonderful fitness to the role they have severally or unitedly to play; and there is the man who, endowed with all this, seeks to go still farther, and from myriads of observations to deduce great general truths. He is the philosopher.