Additional reason for supposing these magnificent birds to have existed not long ago, is found in the fact that specimens of their eggs have been preserved. The circumstances attendant on the discovery and identification of these possess a remarkable interest. In the volcanic sand of New Zealand Mr Walter Mantell found a gigantic egg, which we may reasonably infer to be that of either _Dinornis_ or _Palapteryx_, of the magnitude of which he gives us a familiar idea by saying that his hat would have been but just large enough to have served as an egg-cup for it. This is the statement of a man of science, and therefore we may assume an approximate degree of precision in the comparison. I do not know the size of Mr Mantell's hat, but I find that the transverse diameter of my own is six inches or a little more. If we may take this as the shorter diameter of the ovoid, the longer would probably be about eight and a half inches; dimensions considerably greater than those of the Ostrich's egg (which are about six and a quarter in length), but not what we should have expected from a bird from twelve to fourteen feet in height. And this the rather when we consider that the egg of the New Zealand _Apteryx_, to which these birds manifest a very close affinity, is one of dimensions that are quite surprising in proportion to the bulk of the bird. The Apteryx is about as big as a turkey, standing two feet in height, but its egg measures four inches ten lines by three inches two lines in the respective diameters. The egg of the _Dinornis giganteus_, to bear the same ratio to the bird as this, would be of the incredible length of two feet and a half, by a breadth of one and three quarters! Possibly this specimen, though indubitably the egg of one of this great family of extinct birds, may after all be that of one of the subordinate species. But about the same time as Mr Mantell's discovery, one of equal interest was made in Madagascar. The master of a French ship obtained, in 1850, from natives of the island, three eggs, of far greater size, and fragments of the leg-bones of an immense bird. These, on their arrival at Paris, formed the subjects of valuable investigations by M. Isidore Geoffroy St Hilaire[16] and Professor Owen.[17] The native statement was, that one of the eggs had been found entire in the bed of a torrent, among the debris of a land-slip; that a second egg, with some fragments of bone, was subsequently found in a formation _which is stated to be alluvial_; a third egg, which the natives had perforated at one end, and used as a vessel, was also found. This last egg was broken in the carriage, the other two arrived in Europe entire. These two, though nearly alike in size, differed considerably in their relative proportions and shape, the one being shorter and thicker, with more equal ends than the other. The following table shews the dimensions of both compared with those of an ostrich's egg:--