This last is the optional rule of the American Episcopal Church.
Optional expenditure includes the cost of.
Nature-study, continued in the secondary schools, is an essential part in the curriculum of these schools, and elementary general history, English, French and German are among the optional subjects.
For class ~ the prefectural roads were to be from 24 to 30 ft., and the dimensions of the village roads were optional, according to the necessity of the case.
By the scheme introduced in these memorable terms the course of seven years is divided into two cycles, the first cycle (of four years) having two parallel courses: (1) without Greek or Latin, and (2) with Latin, and with optional Greek at the beginning of the third year.