Note 8 — Treatise on Agriculture.
Reading edition
It appears from Varro Dere rustica and the letters of Cassiodorus, that the Goths introduced into Spain the subterranean granaries, called Siilos, and the art of irrigation. The former are now exclusively used in Tuscany, and Cato's precept, 'Prata irrigua,' &c. shews whence their knowledge of the latter was derived.