196 IP s t e IS ia 



tains much volatile oil which gives it its charac- 

 teristic odor. It is coarse-grained and splits 

 readily, and is much used in the manufacture 

 of shingles. The oil is antiseptic and preserves 

 the wood from decay so that sound cedar logs 

 of very great age are often found lying among 

 and under the living trees of the forest. 



Thuja seedlings, as is common among the 

 Cuprcssiiiccc, ha\e s])reading, acicular leaves 

 which are verv unlike the adult foliage. These 

 leaves are 3-10 millimeters long and are ar- 

 ranged in decussate whorls of three or occasion- 

 ally of four. Xot infrequently one of the leaves 

 of a whorl is dis])laced slightly above the others, 

 and this seems to be uniformly true in the case 

 of a leaf in the axil of which stands a lateral 

 branch. Foliage of the mature form generally 

 appears on some of the side shoots produced 

 during the second year's growth of the seedling, 

 but the leading shoot maintains the juvenile 

 form of foliage for several years. 

 Ciipressiis. Linnaeus, Sp. PL 1002. 1753. 



Evergreen trees with small, scale-like, de- 

 current leaves, and monoecious flowers. Stam- 



