In order to execute the above plan, Mr. Ellicott drew a true meridian line by celestial observation, which passes through area intended for the Congress house. This line he crossed by another due east and west, and which passes through the same area. The lines were accurately measured, and made the basis on which the whole plan was executed. He ran all the lines by a transit instrument, and determined the acute angles by actual measurement, and left nothing to the uncertainty of the compass. REFERENCES. A. The equestrian figure of George Washington, a monument voted in 1783 by the late Continental Congress. B. An historic column—also intended for a mile or itinerary column, from whose station, (at a mile from the Federal House,) all distances and places through the Continent are to be calculated. C. A Naval itinerary column proposed to be erected to celebrate the first rise of a navy, and to stand a ready monument to perpetuate its progress and achievements. D. A church intended for national purposes, such as public prayers, thanksgivings, funeral orations, &c., and assigned to the special use of no particular sect or denomination, but equally open to all. It will likewise be a proper shelter for such monuments as were voted by the late Continental Congress for those heroes who fell in the cause of liberty, and for such others as may hereafter be decreed by the voice of a grateful nation. E. E. E. E. E. Five grand fountains intended with a constant spout of water. N. B. There are within the limits of the springs twenty-five good springs of excellent water abundantly supplied in the driest seasons of the year. F. A grand cascade formed of the waters of the sources of the Tiber. G. G. Public walk, being a square of 1,200 feet, through which carriages may ascend to the upper square of the Federal House. H. A grand avenue, 400 feet in breadth and about a mile in length, bordered with gardens ending in a slope from the house on each side; this avenue leads to the monument A, and connects the Congress garden with the I. President’s park and the K. Well improved field, being a part of the walk from the President’s House of about 1,800 feet in breadth and three-fourths of a mile in length. Every lot deep colored red, with green plats, designating some of the situations which command the most agreeable prospects, and which are best calculated for spacious houses and gardens, such as may accommodate foreign ministers, &c. L. Around this square and along the M. Avenue from the two bridges to the Federal House, the pavements on each side will pass under an arched way, under whose cover shops will be most conveniently and agreeably situated. This street is 106 feet in breadth, and a mile long.