Opposite these houses is the entrance to a sea-water aquarium (six pfennig extra), situated in a large and dark underground vault, which contains crabs, king-crabs, lobsters, a beautiful show of sea-anemones, jelly-fish (which I do not remember having seen in tanks before), sterlet, perch, eels, a salamander, and a tiny seal. Many of the large species are fed with living fish, and it was interesting to watch them catching the small prey. From the top of a high tower over the aquarium, which forms with the duck lake below it one of the most picturesque spots in the Garden, a good view is obtained of the palatial concert-house across a large lake. In this old tower are owl cages, containing, amongst others, the beautiful snowy owl. [Illustration: TOWER AND LAKE, FRANKFORT-ON-MAIN.] The monkey house is close by, containing a rich collection, as well as reptiles and a row of small rodents. An orang-outang came as a present from Sumatra, and is a fine specimen, extraordinarily clever, and almost intellectual. Gigantic pythons are here seen, lolling on the warm sands or bathing in the water-tanks. There are also enormous lizards and iguanas. Next to this house are the hyænas, wolves, jackals, and ice foxes, the latter even in spring keeping their white coats. In 1890 half a dozen wolves were born in the Garden. Passing wild-sheep and goat enclosures, we find in house No. 10 the German native birds on one side, prettily arranged in cages framed with tree-cork, and on the other side of the house are the ostriches and cassowaries, with outside cages. House No. 11 is an extraordinarily well-arranged structure of iron and glass, containing parrots and small tropical birds on one side, and on the other the wading-birds, with outside cages. The exotic-bird collection is contained in 120 small cages and many large cages, forming one of the richest collections in Germany. In 1901 there were exhibited in this house such varieties as the Oriental roller (_Eurystomus orientalis_), Leache’s laughing kingfisher (_Dacelo Leachii_), and many others of equal value. We now come to an unusually good collection of wild swine, including a pair of African wart hogs. Opposite these sheds are a number of extremely well-laid-out flower-beds; in fact, the whole Garden is rich in plants, flowers, and shady trees. The elephant house, with large open-air enclosures, no longer contains ‘Betsy,’ the great female elephant, which has just died; whilst another male Indian elephant has been killed, as he was becoming dangerous. To-day only ‘Fanny’ (who came ten years ago), and a small African elephant, just acquired, are to be found.