these calcareous deposits are made belong to the middle and lower Cretaceous and Jurassic formations, with probably carboniferous limestones beneath that put the deposits in the waters. A dozen different terraces can be traced successively upward from the river bank to the highest part of the formation. Two cones of extinct geysers rise from the deposits, near the hotel,--the Liberty Cap, forty-five feet high, and the Giant's Thumb, somewhat smaller,--both having been built up by the deposits from orifices still seen in their tops, whence the waters have ceased flowing. All these springs, as deposits are made, shift their locality, so that the scene gradually changes as the ages pass. In climbing about this remarkable formation, some of the most beautiful bits of construction and coloring nature has ever produced are disclosed. The Orange Geyser has its sides streaked with orange, yellow and red from the little wavelets slowly trickling out of the steaming spring at the top, which goes off at quick intervals like the exhaust of a steam-engine. At the Stalactite Cave the flowing waters add green to the other colors, and also scale the rocks in places like the back of a fish, while below hang stalactites with water dropping from them. The roof of the cave is full of beautiful formations. The water is very hot when it starts from the top, but becomes quite cold when it has finished its journey down. One of the finest formations is Cleopatra's Bath, with Cupid's Cave beneath, the way to them being through Antony's Gate, all built up of the deposits. Here rich coloring is painted on the rocks, with hot water and steam amply supplied to the bath, which has 154° temperature at the outer verge. All the springs form flat basins with turned-up edges, over which the waters flow, and trickling down the front of the terrace, paint it. When the flow ceases, and the surface has been made snowy white by the atmosphere, it becomes a spongy and beautiful coral, crumbling when touched, and into which the foot sinks when walked upon. The aggregation of the currents run in streams over terrace after terrace, spread out to the width of hundreds of feet, painting them all, and then seeking the Gardiner River, flowing through a deep gorge in front of the formation. Everything subjected to the overflow of these currents gets coated by the deposits, so that visitors have many small articles coated to carry away as curiosities.