The translator of the following work is far from affirming, that he has in no instance deviated from the meaning of his original. To hazard an assertion like this, would be assuming to himself more than is consistent with modesty or, perhaps, with truth. He trusts, however, that such deviations are very rare, that if they do occur they are but slight in themselves, and never connected with facts or principles of practical importance. He can, at least, very confidently declare, that they have never been the offspring of carelessness or design. Should any one open this volume in quest of the flowers of fancy, or the embellishments of style, he will close it again without being gratified. Ambitious only of communicating new and useful matter, and too intent on things to be in any measure choice of his words, the celebrated original was regardless, perhaps to a fault, of the ornaments of diction. Rich in the resources of a capacious and exalted intellect, he poured forth his knowledge like precious ore from the mine, leaving to others of inferior capacities the humbler task of refining and polishing it. With such an example before him, the translator thought it best to follow in some measure the footsteps of his illustrious guide, without venturing to chalk out a new and different track for himself. As his principal object, throughout the work, has been to make himself clearly understood, and that in as few words as practicable, he has never hesitated, when they came in competition, to sacrifice elegance to precision and ornament to perspicuity. He has even in some instances been guilty of intentional tautology, for the purpose of rendering his meaning the more clear and definite. For this he flatters himself he need offer no apology to those, who prefer utility to pleasure and sense to sound. And, as to readers of an opposite cast of mind, should any such choose to sit in judgment on him, he neither deprecates their censure nor courts their approbation. A circumstantial analysis of the following memoirs would constitute a paper too extensive to be introduced here in the form of a preface, and a mere outline or general character of them would be altogether useless. The translation is now before the public, and every reader must judge of its merit for himself. On this point the translator will only observe, that the attention which he has been necessarily led to bestow on the work, has been to him the best school of surgery he ever attended, as far as relates to affections of the bones. Should other practitioners throughout the United States derive equal benefit from perusing his translation, he will rejoice in a consciousness of having, at least in one instance, been of service to his country.