NATURE OF PLANTS 



FIG. 5. Greatly enlarged view of region X in Fig. 4 : e, epidermis ; 

 s, stoma ; p, palisade mesophyll ; ch, chloroplast ; sp> spongy mesophyll ; 

 i, intercellular spaces;.^, small vein cut across; /, end of vein seen from the 

 side, consisting of elongated and banded cells (tracheids) ; col,' collecting 

 cells that transfer material to and from the palisade cells. H. O. Hanson. 



FIG. 6. Surface view of epidermis of lilac leaf: g, guard cell; s, stoma; 

 ch, chloroplasts ; n, nucleus. H. O. Hanson. 



