MICROSCOPIC OBJECTS. 35 



Fig. 69. Transverse Section of the Wood of the Norfolk-Island 

 Pine (Araucaria excelsa), x 120. N. O. Coniferse. 



This network, consisting of the transverse sections of the 

 woody tissue, exhibits the hexagonal form which the cells 

 have taken from the even pressure exerted on all sides. The 

 dark lines represent the transverse sections of the medullary 

 cells. 



The members of this natural order are of great service in 

 the arts and manufactures, their woods being largely used in 

 commerce ; and most of the species secrete resin, turpentine, 

 &c. Pinus larix (the Larch) yields Venetian turpentine. 

 The Cedar of Lebanon also belongs to this natural order. 



Fig. 70. Longitudinal Section of the Wood of the English 

 Yew (Taxus baccata), x 120. N. O. Coniferse. 



The texture of this wood is also very close and hard, the 

 prosenchymatous cells being even smaller than those of the 

 Norfolk-Island Pine; the medullary cells are also close in 

 structure, although rather numerous. 



The fine grain and beautiful shading of some parts of this 

 wood make it useful in turnery and fancy woodwork. It is 

 also used for bows. 



Articles made from this wood are exempt from the ravages 

 of insects &c. 



F2 



