NATURE OF PLANTS 



Fig. 5. Greatly enlarged view of region A' in Fig. 4 : c, epidermis ; 

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

 *, intercellular spaces ; v, small vein cut across ; I, 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. 



