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Thus the complete scale may have consisted of the disjunct tetrachords a-d and e-a, with the tone g-a.

It belongs to the first epoch, which includes portions of the first and second centuries A. D.

You must have lived like a fighting cock here—how many years ago was it, dear old A. D.?

He had driven up quite unexpectedly and unostentatiously, and I did not see even an A.-D.

The dark triangular projection in the lower half of the second drawing was seen and sketched by Huyghens, 1659 A. D.