CELLS, VESSELS, AND TISSUES. 



169 



may perhaps find some of them for yourself out of 

 a piece of rhubarb, when next you have any rhubarb 



a 



Fig. 147. Scalariform vessels (on the right hand). 



tart for dinner. You must tear a very small piece 

 into shreds with a pin or needle, and then try what 

 you can see with your magnifying glass. Under the 



microscope you would see 

 it as in the picture (Fig. 

 148). Now a tissue made 

 up of vessels is called vas- 

 cular tissue* So now you 

 know that it is of cellular 



Fig ; i 4 8.-Annularvesseand tissue (parenchyma or pros- 

 spiral vessels from rhubarb, enchyma) and of vascular 

 tissue that these flowering plants and their parts 

 are made up. 



Notice how the shape of cells and the spaces 

 between them t vary according to the closeness with 



* From the Latin " vascuhim" (vas}, a vessel. 



t These are called ''intercellular spaces," from the Latin "inter" 

 between (the cells). 



