Fifty years ago there was dawning upon the world the first ray of a great discovery. A star was rising in the agricultural world, which was about to shed new light, and like many other valuable discoveries, it was made by one among the lowly, and partly by chance. The author of this new discovery has said, “Error flies with the rapidity of lightning, all obstacles vanish before it. Truth, on the contrary, is admitted coldly, often even with doubt, suspicion, and distrust.” It is owing partly to this, partly to the fact that this new light was given to the world when the mind of farmers were not ready to _receive_ new ideas of progress as they now seek them, and much to the fact that it was the invention of a foreigner described in a foreign tongue. True a translation of it was made through the medium of an American monthly magazine of agriculture; but it was one of limited circulation. At that time the number of periodicals devoted to that interest was few, and such new and important questions were not thoroughly discussed and the knowledge of them placed in every farm-house in the land, as it is at the present day. Shortly after the appearance of M. Guenon’s treatise in the magazine, it was reprinted in book form, and received the large circulation of sixty-five thousand copies, between that time and now, and the book most probably sells better to-day than it did then. By many who procured that book the subject was studied, and advantage taken of its revelations, being stored away in the reader’s mind for actual practice. By the great majority it was read, but not studied; driven from it by the apparent complications of the system and the two hundred sub-divisions of it; by many, perhaps, it was attempted to be put into practice, but without their having given the subject that close investigation which was needed to prove the system correct. It was mostly by this class of persons, because the system was not found to be infallible, that it was denounced and given up, even by men otherwise intelligent; as if anything human could be infallible. Thus it is that by the ignorant its revelations were received with incredulity, and by many of the intelligent with doubt; but to the earnest seekers after practical information, it has unfolded a mine of wealth, and they have proved the system by continuous experience, and found it to be the most reliable mode of judging of the value of every member of the bovine species.