PLATE VI. 



FIG. 91. 



FIG. 93.. 



Dotted cells pith of Elder. 



FIG. 94. 



Circulation of fluid in hairs of Tradescanlia 

 Virginiea. 



Spiral cells : A, Balsam ; B, c, 

 Pleurothallis. 



FIG. 92. 



FIG. 95. 



Portion of the leaf of Sphagnum. 



Spiral fibres of seed-coat of Collomin. 



