36 TEACHING SCIENCE IN THE ELEMENTARY SCHOOL

 (22) 6-V Tobacco Growing in Florida
 Tobacco is one of the state's leading commodities. In
 1896, D. A. Shaw of Quincy, Florida, demonstrated the
 possibility of improving the quality of tobacco by shad-
 ing it during growth. The result of this was a greater
 demand for Florida tobacco and a rapid expansion of
 the industry. The preparing of the soil, the cultivat-
 ing, the shading, and the harvesting of the crop affords
 many leads for study. The many diseases peculiar to
 tobacco and the tobacco insects and their control make
 good science study for boys and girls.

 (23) 6-IV. Fishing Industry
 The numerous social and scientific aspects of the fish-
 ing industry provide a variety of topics. Florida has
 a natural environment for fishing which will furnish
 many situations for science learning. Some of the
 possibilities in this study concerned with science are
 the following: local types of fish, how they breathe and
 eat, hatcheries and their operation, hazards of fishing,
 ways of preservation. Studies of other water inhabi-
 tants as turtles, oysters, and sponges may be a part of
 the unit.

 (24) 3-IV. Florida Sunsets
 The peninsula of Florida has the Atlantic Ocean to the
 east and the Gulf of Mexico to the west and south. Its
 red sunsets are enhanced by the cloud formations in
 the atmosphere. Because Florida is low and flat, this
 brilliant phenomenon can be seen and enjoyed by peo-
 ple in all parts of the state. Sunlight must penetrate
 the atmosphere to reach the land. When the sun is
 overhead, the light does not pass through as much dense
 atmosphere as it would if the sun were low as at sun-
 rise and just before sunset. The sun appears larger
 and a deeper red at sunrise and sunset than at mid-
 day. As sunlight passes through the atmosphere, its
 colors will be dispersed (scattered). The colors of the
 shorter wave lengths, as violet and blue will be scat-
 tered more than those of longer wave lengths, as yel-
 low, orange, and red. The extent to which the colors
 of light will be scattered depends on the amount of sub-
 stances in the atmosphere (density). At sunset when
 the light must pass through a thick layer of this most
 dense atmosphere, the violet and blue colors of light
 will be scattered more than the yellow, orange, and red.