IT is evident, my dearest Secundus, that neither your prudence nor your care has been wanting in this affair of the lake, since, in order to render it of more general benefit, you have provided so many expedients against the danger of its being drained. I leave it to your own choice to pursue whichever of the schemes shall be thought most proper. Calpurnius Macer will furnish you, no doubt, with an engineer, as artificers of that kind are not wanting in his province.