24 TEACHING SCIENCE IN SECONDARY SCHOOLS

 4. Use of audio-visual aids (Refer to section on audio-
 visual aids in part III of this bulletin).
 5. Supplementary reading:
 (1) Library of science materials on different grade
 levels.
 (2) Current readings in science. (Refer to section on
 reading in part III of this bulletin.)

 THE GENERAL SCIENCE TAUGHT WITH PHYSICAL
 OR BIOLOGICAL EMPHASIS
 The requirements for high school graduation as stated in the
most recent State Board Regulations, include: one unit in bio-
logical science for all students; for boys one unit in physical
science; for girls one unit in home economics. The two units in
sciences should be the minimum.
 The Programs of Study for Florida Secondary Schools pro-
vides that where it is not possible to offer both physical and bio-
logical science, general science may be substituted for either the
biological science or the physical science requirement, but in no
instance shall the general science in the same school be permitted
to serve as a substitute for both the biological and physical
science.
 It is recommended that the general science not to be used as a
substitute for either the biological or the physical science re-
quired courses, but that the general science be used, as it properly
should be used, as a general overview of all the science fields.

 The physical science emphasis. If, because of lack of equip-
ment for the senior high physical sciences, the ninth grade gen-
eral science must be used as a substitute (not the recommended
procedure) the course should definitely carry major emphasis
on the physical sciences for which it is to substitute. If this em-
phasis is to be pursued the biological section of the course will be
reduced to a simple overview. The physical science section will
need to be expanded by the use of related reading materials, addi-
tional experiments and demonstrations, applications to industry,
development of inventions, and history of scientists.