COMBINATIONS OF CELLS. TISSUES. 



511 



the organs of flowers, as may be seen in petals. In stems and leaf-stalks, 

 especially of fast-growing organs, the constituent cells are often very 



Fig. 559. 



\ 



\ 



Fig. 569. A, B, C. Spiral vessels from Sambucus Fibulu*. Magn. 400 diam. 



Fig. 562. 



Fig. 560, 



Fig. 561. 



E^sEEr^ff 51 * 





400 diam. 



