836 LAWS OF MARYLAND. [CH. 382

schools; and provided, further, that this certificate shall be
valid for the principalship of a high school either of the second
group or of the third group.

A junior high school teacher's certificate in the academic
subjects, valid throughout the State for three years, renewable
on evidence of successful experience and professional spirit
and six weeks' additional preparation in a standard institu-
tion, and valid for assistant teachers in all State-aided high
schools of the second group and for teachers or principals in all
State-aided high schools of the third group, may be granted to
persons who have completed three years of standard college
work, or the equivalent, including six semester hours in pro-
fessional subjects.

6. A high school teacher's certificate in the special branches
of music, manual or industrial training, domestic science and
art, fine and applied arts, commercial branches or agriculture,
valid throughout the State for three years, renewable on evi-
dence of successful experience and professional spirit, and
required in all State-aided high schools and schools rated as high
schools by the State Superintendent of Schools, may be granted
to persons who have completed a four years' high school course
or the equivalent, who have had two years of additional work
of a college grade, approximately one-third of which was in
general academic subjects and approximately two-thirds in
the special branch or branches for which the special high school
certificate is issued, including as a part of their preparation
not less than two hundred recitation hours in the theory of
education and in the art of teaching their specialty. Such a
certificate may also be granted to persons having an equivalent,
academic and professional preparation on examination of equiv-
alent standard, provided that this sub-section shall not go into
effect until September first, 1919.

7. An elementary school principal's certificate, valid
throughout the State for three years, renewable on evidence of
successful experience and professional spirit and required in
all elementary schools having three or more teachers, includ-
ing the principal, may be granted to persons who have had a
four years' high school course or the equivalent; who have
completed a two years' standard normal school course, or the
equivalent, who have had in addition not less than a full half-
year's work at a recognized college or university in elementary
school methods, supervision, and administration, and who have
had three years of teaching experience in the elementary