In these high and stony valleys every available patch of ground is utilized for the cultivation of barley, even up to altitudes of 7000 and 8000 ft.
Ephemeridae are found all over the world, even up to high northern latitudes.
It lived and flourished far beyond this time, when transplanted to Rome, not less than in its native Alexandria, and appears to be recognizable even up to the beginning of the middle ages.
For a long time this hope proved illusory, and in the case of Egyptian archaeology the results have proved disappointing even up to the very present.
But it is found not to vary at all, even up to the second order of the ratio of the earth's velocity to that of light.
