There is one more chamber to visit in the Lucas Cave. To reach it the visitor ascends four steps, and travels north-west about 14 yards to the head of a wire ladder, which he descends to a place directly underneath the Snowball Cave, and then he goes down the steps into the Wallaby Bone Cave, over the entrance to which is a very pretty cluster of stalagmites, from 6 inches to 18 inches long, and varying from the thickness of a straw to three-quarters of an inch in diameter. The floor is covered with wallaby bones, and in the immediate vicinity are quantities of osseous breccia. CHAPTER XIII. THE BONE CAVES. The Bone Caves are intensely interesting, and a considerable amount of attention has been paid to them by scientists. In 1867, Professor Owen, when writing to the Colonial Secretary, said that the natural remains obtained from the limestone caves of Wellington Valley in 1832, "revealed the important and suggestive fact that the marsupial type of structure prevailed in the ancient and extinct as well as in the existing quadrupeds of Australia." Seventeen years ago there was an expedition to the Wellington Valley Bone Caves. Parliament voted £200 for the purpose, and an investigation was made by Mr. Gerard Krefft, who at that time was curator of the Australian Museum, and Dr. Thompson. They obtained many valuable and rare specimens, some of which were said to be quite new to science, consisting of the remains of mammals, birds, and reptiles. The largest bones and teeth discovered were of a size equal to those of a full-grown elephant. They were remains of diprotodons and nototheriums, gigantic marsupials now extinct.