Re-descending from the Plateau once more to the large fountain, the visitor turns to the left, and proceeds round its margin until he arrives at the further end of the basin, where he will notice an ornamental cataract is contrived. On the left-hand of the path which winds from this point, is a high bank constructed of roots of the trees which grew in the woods once covering a great part of the Crystal Palace gardens. The effect is very striking and picturesque, being greatly aided by the wild flowers which grow so luxuriantly on all parts. It will have been noticed that round the confines of the lake we have just quitted, where the geological restorations are, the flowers are purposely nearly all wild ones, and they give a singularly natural and fit appearance to this interesting district. It must be mentioned that the whole of the Crystal Palace Exterior Gardens are under the personal superintendence of Mr. Edward Milner, and it will be confessed their beautiful condition answers to his assiduous care. A few steps further, and the visitor arrives at the junction of two roads. Selecting that to the left, he will speedily gain the foot of the Rosary, and the mound, at the top of which is an ornamental arabesque arcade designed by Mr. Owen Jones. He will here find roses of every variety, besides other plants which climb the sides and around the roof of the arcade. [Illustration: The Secondary Island. 1. Mosasaurus. 2. & 3. Pterodactyles. 4. & 5. Iguanodons. 6. The Hylæosaurus. 7. The Megalosaurus. 8. & 9. The Teleosauri. 10. The Ichthyosaurus Communis. 11. The Ichthyosaurus Platyodon. 12. Plesiosaurus Macrocephalus. 13. The Labyrinthodon Salamandroides. 14. & 15. Dycynodons. 16. Labyrinthodon Pachygnathus.] Proceeding round the Rosary to the right, we quit the mound at the second outlet, and journey along a path, on either side of which are flower-beds and groups of Rhododendrons and Azaleas. Bearing to the right we reach the basin of a fountain. Choosing the left-hand side of this basin, we turn into the broad walk which leads us by means of a flight of steps to the second terrace, crossing which we make our way by the steps to the upper terrace. At this point the visitor can either re-enter the Palace under the Central Transept, or by proceeding to the left-hand down the terrace, enter the south wing and pass down the colonnade to the Railway Station. THE CRYSTAL TOWERS. The high towers, of which there are two, one at each end of the building, have been erected for the purpose of raising the tanks from which the high jets of the great fountains in the lower basins are played, and are, with the exception of the tank and stays, constructed of cast iron.