PLATE VII. 



Gritty tissue Pear. 



Spiral vessels: A, reticulated; B, old 

 vessel, with perforations; c, D, spiral 

 vessels, becoming annular. 



FIG. 97. 



FIG. 100. 



Wood-fibre-flax. 



Lactiferous vessels. 



FIG. 98. 



FIG. 101. 



Section of Coniferous Wood in the 

 direction of the fibres. 



Cubical parenchyma, with stellate cells, 

 from petiole of Nuphar lutea. 



