His lost
Ars, a system of
grammar much used in his own time and largely drawn upon by later grammarians, contained rules for correct
diction, illustrative quotations and discussed
barbarisms and
solecisms. An extant
Ars grammatica (discovered by
Jovianus Pontanus in the 15th century) and other unimportant treatises on similar subjects have been wrongly ascribed to him. In this poem, first edited in 1528, the term
gramma is used for a weight equal to two
oboli. (Two oboli—a
diobol—corresponds to 1/24th of a
Roman ounce or about 1.14 grams.) This eventually led to the adoption of the term
gram as a unit of weight (
poids, later of mass) by the French
National Convention in 1795. == References ==