Cicero's days and a little later, it was the almost
universal practice to write a double s, whenever that
letter occurred between two long vowels or after a
long vowel, as for example in caussae, cassus, diuissiones.
That he and Vergil both used this spelling is shown
by their own autograph manuscripts.
Quintilian. With an English Translation. Harold Edgeworth Butler. Cambridge. Cambridge, Mass., Harvard University Press; London, William Heinemann, Ltd. 1920.
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