Per

In Latin phrases. A preposition meaning by or through. PER AES ET LIBRAM (Lat. aes, brass, libram, scale).

In civil law

A sale was said to be made per aes et libram when one called Ubripens held a scale (libra), which the one buying struck with a brazen coin {aes), and said, "I say, by the right of a Roman, this thing is mine," and gave the coin to the vendor, in presence of at least three witnesses. This kind of sale was used in the emancipation of a son or slave and in making a will. Calv. Lex. "Mancipatio;" Vicat, "Mancipatio." PER ALLUVIONEM (Lat.) In civil law. By alluvion, or the gradual and imperceptible increase arising from deposit by water. PER ALLUVIONEM ID VIDETUR ADJIci, quad Ita paulatim adjlcltur, ut intelligere non possumus quantum quoquo momento temporls adjiclatur. That is said to be added by alluvion which is so added little by little that we cannot tell how much is added at any one moment of time.

Dig. 41. 1. 7. 1; Hale de Jur. Mar. par. 1, c. 4; Fleta, lib. 3, c. 2, § 6.