I n the summer of 1878 an artist friend, Mr. T. H. Thomas, was passing through Newton Nottage, a village near Forth-Cawl, Glamorganshire, when his attention was arrested by some three-toed footprints, deeply impressed in the surface of a slab of rock and rendered particularly visible by the slanting rays of the setting sun. Understanding the full value of his discovery, he at once communicated it to Mr. R. W. Jones of Newport, Monmouthshire, who, with his brother, Mr. T. Jones, Jun., F.G.S., takes a deep interest in every thing connected with the progress of geology. Mr. T. Jones at once commissioned Mr. J. Storrie, the valued Curator of the Cardiff Museum, to obtain casts of the footprints in plaster of Paris; and Mr. R. W. Jones suggested that casts should also be taken of the footprints of some living birds for comparison. Accordingly Mr. Storrie set about his work, which he most successfully accomplished; and Mr. Thomas and myself obtained casts, in mud and in modelling-clay, of the footprints of an Emu living in the Gardens of the Clifton Zoological Society, and of a Rhea and a Cassowary which are preserved in a stuffed state in the Bristol Museum. Finally all the accumulated facts and material were placed in my hands for description. The Slab of Stone.—This is now lying in the N.E. corner of the green in front of the church at Newton Nottage*. At one time it lay in front of the steps of the village inn, and