We cannot assign a positive date to the beginning of the First Dynasty, chiefly because Egyptologists are at a loss to know whether to consider all the dynasties of Manetho's list as successive or in part contemporaneous. Thus, it is held by some scholars that several of these families were reigning at the same time in the different cities of Upper and Lower Egypt; while others think that they all reigned at different epochs, and that the sum of the lengths of the several dynasties gives us the true date of the beginning of the political history of the country. Accordingly, some place the beginning of the First Dynasty at about 5000 B.C., while others put it at about 3000 B.C. The constantly growing evidence of the monuments is in favor of the higher figures. MENES, THE FIRST OF THE PHARAOHS.--Menes is the first kingly personage, shadowy and indistinct in form, that we discover in the early dawn of Egyptian history. Tradition makes him the founder of Memphis, near the head of the Delta, the site of which capital he secured against the inundations of the Nile by vast dikes and various engineering works. To him is ascribed the achievement of first consolidating the numerous petty principalities of Lower Egypt into a single state. THE FOURTH DYNASTY: THE PYRAMID KINGS (about 2700 B.C.).--The kings of the Fourth Dynasty, who reigned at Memphis, are called the Pyramid builders. Kufu I., the Cheops of the Greeks, was the first great builder. To him we can now positively ascribe the building of the Great Pyramid, the largest of the Gizeh group, near Cairo; for his name has been found upon some of the stones,--painted on them by his workmen before the blocks were taken from the quarries. The mountains of stone heaped together by the Pyramid kings are proof that they were cruel oppressors of their people, and burdened them with useless labor upon these monuments of their ambition. Tradition tells how the very memory of these monarchs was hated by the people. Herodotus says that the Egyptians did not like even to speak the names of the builders of the two largest pyramids. THE TWELFTH DYNASTY (about 2300 B.C.).--After the Sixth Dynasty, Egypt, for several centuries, is almost lost from view. When finally the valley emerges from the obscurity of this period, the old capital Memphis has receded into the background, and the city of Thebes has taken its place as the seat of the royal power. The period of the Twelfth Dynasty, a line of Theban kings, is one of the brightest in Egyptian hhistory. Many monuments scattered throughout the country perpetuate the fame of the sovereigns of this illustrious house. Egyptian civilization is regarded by many as having during this period reached the highest perfection to which it ever attained.