6. Every board that maintains in its schools a special class for children who are unable, by reason of physical or mental deficiency, to avail themselves of the instruction given in the regular classes shall receive, per pupil in such class, an additional grant equal to twice the grant to which it is entitled under section 3.
Such grant shall be payable only if such class has not less than ten nor more than twenty pupils, and the teacher in charge of it holds an adequate specialist’s certificate.
R. S. 1964, c. 237, s. 8.