THE ECONOMIC BIOLOGY OF PLANTS 



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and consists of the partly decomposed and compressed peat moss, 

 similar to that in which florists pack their plants. From coal are 



FIG. 145. Flax (Linum usitaiissimum, Flax Family, 

 Linaceas). Plant in flower. Young flower-cluster. 

 Seed, entire and cut vertically. (Baillon. ) Annual, 

 about 60 cm. tall; leaves smooth; flowers light blue; 

 fruit dry. Native home, Southeastern Europe and 

 Asia Minor. From Sargent. 



also obtained a vast number of dyes, medicines, explosives, and 

 other products which will be studied in chemistry. 



Paper Materials. All forms of paper are made from plant mate- 

 rial, chiefly from wood fibers of spruce, poplar, and similar trees. 



