After fresh trouble with the clergy, he returned to Paris and published a defence of his theories in a work entitled Ides sur la politique de Platon et d'Aristole.
Ides, counting inclusively.
Instead of distinguishing the days by the ordinal numbers first,, second, third, &c., the Romans counted backwards from three fixed epochs, namely, the Calends, the Nones and the Ides.
Special sacrifices were offered on the kalends, nones, and ides of every month, and on the occasion of important family events.
From these three terms the days received their denomination in the following manner: - Those which were comprised between the Calends and the Nones were called the days before the Nones; those between the Nones and the Ides were called the days before the Ides; and, lastly, all the days after the Ides to the end of the month were called the days before the Calends of the succeeding month.