Whether, in view of this departure from the original conception, Sir William, if starting _de novo_, would have grouped all these separate collections in a single apartment, or whether he would have split them up and placed them at the commencement of the various series in the exhibition galleries to which they respectively pertain, may be a moot point. But, at anyrate, no detriment to his work would ensue if such a splitting-up should be thought desirable in the future. And considerable advantages would undoubtedly result if the series displaying the general morphology and anatomy of the mammals were placed at the entrance of the mammalian gallery, and so on with the other series at present exhibited in the Index Museum. Be this as it may, the series of specimens and preparations arranged in the Index Museum under the immediate superintendence of Flower is probably unrivalled in its way, and displays in a marked manner that attention to detail and that eye to artistic effect which were among his special attributes. In the “bay” devoted to mammals, special attention was given to the display of specimens illustrating the various forms assumed by the teeth in the different orders and families, and their mode of succession and replacement;—subjects in which Flower always displayed special interest, and in regard to which he made some important discoveries. Here, too, were exhibited during the latter half of his tenure of office the skeletons and half-models of a man and a horse, placed in juxtaposition, in order to display the special adaptations and modifications for, on the one hand, the upright posture and great brain-capacity, and, on the other, for the high degree of speed and endurance essential to an otherwise defenceless quadruped living, in a wild state, on open plains. In this exhibit, which forms the frontispiece to his well-known and deservedly popular little work on _The Horse_, Sir William always took an especial pride; and it was one of the first objects to which he directed the attention of the many illustrious and distinguished visitors who sought his guidance in viewing the collections under his charge. Another specimen in the same “bay” of which he was especially proud is the skeleton of a young chimpanzee, dissected by Dr. Tyson, and described by that anatomist in a work published in 1699, under the title of the _Anatomie of a Pigmie_, being the earliest scientific description of any man-like ape.