When the north and the south were added to the other two cardinal points the intimate association of the east and the west with the measurement of time would be extended to include all the four cardinal points.[403] Four became a sacred number associated with time-measurement, and especially with the sun.[404]

Many other factors played a part in the establishment of the sanctity of the number four. Professor Lethaby has suggested[405] that the four-sided building was determined by certain practical factors, such as the desirability of fashioning a room to accommodate a woven mat, which was necessarily of a square or oblong form. But the study of the evolution of the early Egyptian grave and tomb-superstructures suggests that the early use of slabs of stone, wooden boards, and mud-bricks helped in the process of determining the four-sided form of house and room.

When, out of these rude beginnings, the vast four-sided pyramid was developed, the direction of its sides was brought into relationship with the four cardinal points; and there was a corresponding development and enrichment of the symbolism of the number four. The form of the divine house of the dead king, who was the god, was thus assimilated to the form of the universe, which was conceived as an oblong area at the four corners of which pillars supported the sky, as the four legs supported the Celestial Cow.

Having invested the numbers four and twenty-eight with special sanctity and brought them into association with the measurement of time, it was a not unnatural proceeding to subdivide the month into four parts and so bring the number seven into the sacred scheme. Once this was done the moon's phases were used to justify and rationalize this procedure, and the length of the week was incidentally brought into association with the moon-goddess, who had seven avatars, perhaps originally one for each day of the week. At a later period the number seven was arbitrarily brought into relationship with the Pleiades.

The seven Hathors were not only mothers but fates also. Aphrodite was chief of the fates.

The number seven is associated with the pots used by Hathor's priestesses at the celebration inaugurating the new year; and it plays a prominent part in the Story of the Flood. In Babylonia the sanctity of the number received special recognition. When the goddess became the destroyer of mankind, the device seems to have been adopted of intensifying her powers of destruction by representing her at times as seven demons.[406]

But the Great Mother was associated not only with the week and month but also with the year. The evidence at our disposal seems to suggest that the earliest year-count was determined by the annual inundation of the river. The annual recurrence of the alternation of winter and summer would naturally suggest in a vague way such a subdivision of time as the year; but the exact measurement of that period and the fixing of an arbitrary commencement, a New Year's day, were due to other reasons. In the Story of the Destruction of Mankind it is recorded that the incident of the soothing of Hathor by means of the blood-coloured beer (which, as I have explained elsewhere,[407] is a reference to the annual Nile flood) was celebrated annually on New Year's day.

Hathor was regarded in tradition as the cause of the inundation. She slaughtered mankind and so caused the original "flood": in the next phase she was associated with the 7000 jars of red beer; and in the ultimate version with the red-coloured river flood, which in another story was reputed to be "the tears of Isis".

Hathor's day was in fact the date of the commencement of the inundation and of the year; and the former event marked the beginning of the year and enabled men for the first time to measure its duration. Thus Hathor[408] was the measurer of the year, the month, and the week; while her son Horus (Chronus) was the day-measurer.

In Tylor's "Early History of Mankind" (pp. 352 et seq.) there is a concise summary of some of the widespread stories of the Fountain of Youth which restores youthfulness to the aged who drank of it or bathed in it. He cites instances from India, Ethiopia, Europe, Indonesia, Polynesia, and America. "The Moslem geographer, Ibn-el-Wardi, places the Fountain of Life in the dark south-western regions of the earth" (p. 353).