THE MOLECULAR FORCES IN PLANTS. 



Ill 



I. 



c 



.K J> 



FIG. 34.- Tilia parvifolia. Elements of the secondary wood and bast isolated by macera- 

 tion. A and B, wood fibres (libriform fibres) ; C, wood parenchyma ; D and E, tracheides ; 

 F, segment of a vessel ; G, bast fibre. Magn. 180. (After Strasburger.) 



