Incipit liber tercius de vocabulo arithmetice disciplinae

Beginning text of the third book of Etymologiae, about arithmetic.
Title page in: De vocabulo arithmetic disciplinae / Saint Isidorus, Bishop of Seville. In his Etymologiae. [Augustae Vindelicorum] : G. Zainer, 1472.
Published in: The tradition of science / Leonard C. Bruno. Washington, D.C. : Library of Congress, 1987, p. 229.