The number of published weights did not exceed 600 of all standards in 1880; but the collections from Naucratis (28), Defenneh (29) and Memphis (44) have supplied over six times this quantity, and of an earlier age than most other examples, while existing collections have been more thoroughly examined.
In weights of the same place and age there is a far wider range; at Defenneh (29), within a century probably, the average variation of different units is 1/36, 1/60, and 1/67, the range being just the same as in all times and places taken together.
That this mode of originating standards was greatly promoted, if not started, by the use of coinage we may see by the rarity of the Persian silver weight (derived from the Assyrian standard), soon after the introduction of coinage, as shown in the weights of Defenneh (29).
The main series on which we shall rely here are those -- (1) from Assyria (38) about 800 B.C.; (2) from the eastern Delta of Egypt (29) (Defenneh); (3) from western Delta (28) (Naucratis); (4) from Memphis (44) -- all these about the 6th century B.C., and therefore before much interference from the decreasing coin standards; (5) from Cnidus; (6) from Athens; (7) from Corfu; and (8) from Italy (British Museum) (44).
It is scarcer at Defenneh (29) and rare at Memphis (44).
4000; 400,000 Another unit, which has scarcely been recognized in metrology hitherto, is prominent in the weights from Egypt -- some 50 weights from Naucratis and 15 from 400 Defenneh plainly agreeing on this and on no other basis.
In the medical papyrus (38) a weight of 2/3rds kat is used, which is thought to be Syrian; now 2/3 kat = 92 to 101 grains, or just this weight which we have found in Syria; and the weights of 2/3 and 1/3 kat are very rare in Egypt except at Defenneh (29), on the Syrian road, where they abound.
In Egypt the mean value at Naucratis (29) was 66.7, while at Defenneh (29) and Memphis (44) -- probably rather earlier -- it was 67.0.