This magnificent Hospital presents an imposing range of buildings in the Grecian style of architecture, extending several hundred feet along the right bank of the Thames, and divided into two wings by a noble lawn, with a descent to the water's edge by a handsome flight of steps. The wings recede a considerable space from the river and are crowned in the distance by two lofty domes, behind which rise the acclivities of the royal park, covered with trees of centuries, and undulating with variegated masses of verdure. Through the midst of these, and occupying the site of the original fortress of Greenwich, rises that celebrated Observatory which has so frequently engaged the attention of scientific Europe; and with which the names of Flamsteed, Halley, Bradley, Bliss, Maskelyn, Pond, and Airey, are so emphatically connected. To the history of Greenwich Hospital we can only very briefly advert. After the rebellion in 1715, the forfeited estates of the Earl of Derwentwater, amounting at that time to six thousand pounds per annum, were voted by parliament to this hospital; and with the numerous benefactions since bestowed by private individuals, it is now enabled to provide for nearly three thousand inmates. Every Pensioner receives a liberal allowance of provisions and clothes, with a shilling a week for pocket-money. The nurses--widows of seamen, and of whom there were lately a hundred and five--in addition to provisions, have each an annual allowance of from eighteen to twenty pounds. A library is provided for the exclusive use of the Pensioners. The office of governor of Greenwich Hospital is generally conferred on veterans of the highest rank and standing in the service,--such as Hood, Keats and Hardy, the friend and companion of Nelson. [Illustration: THE PORT OF LONDON.] THE PORT OF LONDON. The Port of London commences at London Bridge. The forest of masts which rises in direct view--thickening in perspective till it is lost in the distance--announces the vast extent of that Commerce which stretches its arms to the "uttermost parts of the globe." The Pool, as this part of the river is called, extends from London Bridge to Deptford,--a distance of nearly four miles, with an average breadth of from four to five hundred yards. It consists of four divisions, called the Upper, Middle, and Lower Pools, and that occupying the space between Limehouse and Deptford. The Upper Pool extends from London Bridge to Union Hole--a space of about sixteen hundred yards; from this to Wapping New Stairs forms the Middle Pool--about seven hundred yards. The Lower Pool extends from the latter point to Horseferry Pier, Limehouse--about eighteen hundred yards. The fourth Pool occupies the space between Limehouse and Deptford--about two thousand seven hundred yards.