Streams and Ponds.—The Zoological Park contains about 34 acres of still water, of which Bronx Lake comprises 25 acres, Lake Agassiz 5½ acres, Cope Lake, the Wild-Fowl Pond, and Beaver Pond together, about 3½ acres. The two larger lakes are fed by the Bronx River, which drains a valley about 15 miles long. Even in the driest seasons the volume of water carried down by the Bronx River is sufficient to keep the lakes well filled. The areas of still water available for animal collections are very generous for an institution like this, and are highly prized. The Waterfall.—At the lower end of Lake Agassiz, and about 300 feet above the Boston Road Bridge, is a natural waterfall nearly 12 feet in height, where the Bronx River falls over a rugged ledge of pink granite. In times of high water the foaming flood that thunders over the rocks makes an imposing spectacle, and it constitutes a most unusual feature to be found in a city park. During the year 1901, an improvement was made which added very greatly to the beauty of this feature by extending the rock ledge about 200 feet farther, to the rocky side of Wilson Hill, thereby greatly increasing the water area of Lake Agassiz, and at the same time forming a beautiful island. Forests.—The crowning glory of the Zoological Park is the magnificent forest growth which covers, thickly or sparsely, about two-thirds of its land area. It consists chiefly of white, scarlet, black, red and pin oaks, tulip, sweet gum, hickory, beech, sassafras, maple, wild cherry, hornbeam, dogwood, tupelo, hemlock and cedar; but there are at least thirty other species of trees and shrubs. Thanks to the wise foresight and broad views of David and Philip Lydig, who for about eighty years were the sole owners of nearly the whole of the Zoological Park site, the virgin forest was not cut down for firewood or lumber, but was carefully preserved for posterity. As the legal custodian of this splendid domain of Nature, the Zoological Society is as rapidly as possible going over the entire forest, to arrest decay and death, and take all needed measures for the preservation of the trees. It is safe to say that nowhere else within fifty miles of New York can there be found any more beautiful forests than those in the central and eastern portions of the Park. Throughout the enclosed grounds, it is absolutely necessary that visitors should be restricted to the walks; for otherwise the feet of our millions of visitors would quickly destroy every ground plant. The Rocking Stone, No. 45, a colossal cube of pinkish granite, poised on one of its angles on a smooth pedestal of rock, is the Zoological Park’s most interesting souvenir of the glacial epoch. Across the bare face of the rocky hill in which lies the Crocodile Pool, there are several glacial scratches pointing directly toward the famous boulder; and who will say it had no part in making one of them?