/ · 1894 Brewer’s · S · Summa Diligentia
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On the top of a diligence. “Cæsar crossed the Alps ‘summa diligentia.ʹ” This is a famous schoolboy joke, and one of the best of the kind.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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