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; v, 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; i, stoma; ch, 

 chloroplasts; re, nucleus. — H. O. Hanson. 



