38 TEACHING SCIENCE IN SECONDARY SCHOOLS

 6. To explain many familiar home phenomena.
 7. To offer guidance into chemical vocations.
 8. To develop appreciation of researches of great chemists
 who have laid the foundations of our present chemical
 knowledge.

 The classroom-nucleus of directed activity. Certain methods
may be used to maintain a high level of interest.
 1. Correlate class and laboratory work closely. Failure to
 do this ignores the learning characteristics of young
 people.
 2. Arouse interest or clinch a fact by interspersing a class
 discussion or explanation with short illustrative experi-
 ments.
 3. Endeavor to have assignments develop as logical need
 felt by the students. Planned work should be clear,
 definite, and reasonable.
 4. Allow free exchange of ideas.
 5. Encourage questioning on the part of students.
 6. Promote the use of clear, concise English in class dis-
 cussions.
 7. Broaden the vocabulary by constant application of
 chemical nomenclature and enlarge concepts of familiar
 terms.
 8. Use reading to supplement the text, to provide in-
 formation on present and future use of chemistry in
 Florida, and to supply an interesting background of
 chemistry.
 9. Use carefully chosen audio-visual aids such as wall charts,
 radio programs, slides, filmstrips and films.
 10. Advocate wherever possible carefully planned trips to
 points of chemical interest.
 (a) Make preliminary plans for arrangements with
 school and industry officials.
 (b) Get faculty cooperation.