There shall be annually apportioned to such school from the moneys appropriated by the state legislature for the support of the public schools of the state the sum of one thousand dollars and an additional sum of two hundred dollars for each teacher employed therein for a period of thirty-six weeks during each school year, whose entire time is given to the instruction of pupils in such school.

No such apportionment shall be made unless there are at least fifteen pupils enrolled and actually in attendance at such school during such period of thirty-six weeks, and unless such school maintains an organization and a course of study, and is conducted in a manner approved by the commissioner of education.