246 



INDEX 



Vessels, scalariform, 121, *123 

 , spiral, 121, *123 

 , structure of, 121 

 , walls of, 121 

 Virtual images, 28, *29 



W 

 Water, absorption of, 113 



pores, 118 



Wood, cell contents, 182 

 , definition, 177 

 - fibers, 80, *106, *107, 108, 



*180, *181. 

 , medullary rays, 179, *180, 



*181 



parenchyma, 178, *181 



Wood, pith, 182 

 - structures, 177, *180, *181 

 , xylem elements, 178 

 Working distance, *34, 38 



Xylem bundles, *78, 80 



elements in woods, 178, *180, 



*181 



- fibers, 80, *106, *107, 108, 

 *180, *181 



Zenker's fluid, 229 



Zinc chloriodide solution, 229 



