Each has a name of his own--the one, _Chang_, and the other, _Eng_; but, when persons wish to address them as one--to claim their attention to anything, for example, or to call them--they are addressed as--_Chang Eng_. The union of twins is not an unusual occurrence, and various anatomical collections present many such objects. Ambrose Paré relates several instances. Dr. Warren is, however, of opinion, that the _Siamese Boys_ present the most remarkable case of the _lusus naturae_ which has yet been known, taking into view the perfection and distinctness of organization, and the length of time they have lived. The whole phenomenon may be described in a very few words--_two perfect bodies united and bound together by an inseparable link_. As we have already stated, their health is at present good; but, observes Dr. Warren, "it is probable that the change of their simple living for the luxuries they now obtain, together with the confinement their situation necessarily involves, will bring their lives to a close within a few years." We hope that such will not be the result of their leaving their native shores; and we are much pleased with this passage in a letter from Drs. Samuel Mitchill and Anderson to Capt. Coffin--"They (the youths) are under the protection of a kind and benevolent gentleman, and we know you will take good care of them, and if they live, return them to their homes again." Of their strength many instances are related: since they have arrived in London they have lifted a gentleman of considerable weight, with great ease; and on this point Drs. Mitchill and Anderson say--"As they are so vigorous and alert, we readily coincide that in ten seconds they can lay a stout ordinary man on his back." We shall not go out of our way to state half the curious questions which forcibly arose in our minds on visiting this interesting exhibition. One of the most important, and least easy of solution, is the structure of the connecting band--how it is kept alive--whether blood flows into and circulates through it from each, and passes into the system of the other--whether it be composed of bone, as well as of cartilage--and whether it could be safely divided? Upon examining the connexion, or _cord_, Dr. Warren says--"Placing my hand on this substance, I found it extremely hard. On further examination, the hardness was found to exist at the upper part of the cord only, and to be prolonged into the breast of each boy. Tracing it upwards, I found it to be constituted by a prolongation of the _ensiform cartilage of the sternum_, or extremity of the breast-bone. The cartilages proceeding from each sternum meet at an angle, and then seem to be connected by a ligament, so as to form a joint. This joint has a motion upwards and downwards, and also a lateral motion--the latter operating in such a way, that when the boys turn in either direction, the edges of the cartilage are found to open and shut. * * * * *