but the principal teacher needs an assistant quite as much when a school of fifty is reduced to an average of thirty by absences as when it rises to seventy by a regular attendance of all the scholars belonging to it
But the principal teacher needs an assistant quite as much when a school of fifty is reduced to an average of thirty by absences as when it rises to seventy by a regular attendance of all the scholars belonging to it.
But the principal teacher needs an assistant quite as much when a school of fifty is reduced to an average of thirty by absences as when it rises to seventy by a regular attendance of all the scholars belonging to it.