(b) For clothing.
(c) Other uses.
—How green plants are harmful to man.
Suggested Laboratory Work
If a commercial museum is available, a trip should be planned to work over the topics in this chapter. The school collection may well include most of the examples mentioned, both of useful and harmful plants.
A study of weeds and poisonous plants should be taken up in actual laboratory work, either by collection and identification or by demonstration.
Green Plants have a "Dollar and Cents" Value.—To the girl or boy living in the city green plants seem to have little direct value. Although we see vegetables for sale in stores and we know that fruits have a money value, we are apt to forget that the wealth of our nation depends more upon its crops than it does on its manufactories and business houses. The economic or "dollars and cents" value of plants is enormous and far too great for us to comprehend in terms of figures.
We have already seen some of the uses to mankind of the products of the forest; let us now consider some other plant products.
Leaves used as food.