The Rev. Richard Taylor, in his "_Te ika a maui_," refers to interesting caves near Mokau (New Zealand), in some of which bones of the moa have been discovered. About a mile from Pukemapau he came to a limestone range, and entered a large cave called Tanaureure. At the bottom of a chasm he found a fine crystal spring, about a foot or so deep, but appears not to have been particularly inquisitive as to whence the water came or whither it went. A little distance up one of the tributaries of the Rewa River, in Fiji, is a crystal streamlet which flows on towards a lofty ridge, near to which it sinks into the earth. At the mouth of a dark cavern can be heard the roaring. It is a grand expansive excavation, but "Dark as was chaos ere the infant sun Was roll'd together, or had tried his beams Athwart the gloom profound." The water rushes through narrow chasms as through a race, collects in a large pool, and flows through a distant outlet, marked by a speck of light, like a tiny star. At the Weathercote Cave, in Yorkshire, a stream swallowed up by a rocky mouth is thus described by Walter White in his book entitled "A Month in Yorkshire":-- "The rocks are thickly covered in places with ferns and mosses, and are broken up by crevices into a diversity of forms, rugged as chaos. A few feet down, and you see a beautiful crystalline spring in a cleft on the right, and the water turning the moss to stone as it trickles down. A few feet lower, and you pass under a natural bridge formed by huge fallen blocks. The stair gets rougher, twisting among the big, damp lumps of limestone, when suddenly your guide points to the fall at the farther extremity of the chasm. The rocks are black, the place is gloomy, imparting thereby a surprising effect to the white rushing column of water. A beck running down the hill finds its way into a crevice in the cliffs, from which it leaps in one great fall of more than 80 feet, roaring loudly. Look up: the chasm is so narrow that the trees and bushes overhang and meet overhead; and what with the subdued light and mixture of crags and verdure, and the impressive aspect of the place altogether, you will be lost in admiration. "To descend lower seems scarcely possible, but you do get down, scrambling over the big stones to the very bottom, into the swirling shower of spray. Here a deep recess, or chamber, at one side, about eight feet in height, affords good standing ground, whence you may see that the water is swallowed up at once, and disappears in the heap of pebbles on which it falls."