i PLATE I. 

I. Skin from the underside of a leaf of the Snowdrop to show the 
pores. x70. P =pore, between two short lines: the, usually 
longer, single lines are not pores. Fig. 1. 
II. The Root of the Yellow Flag. A, cut across; B, cut lengthways. 
In A the pipes appear as a ring of seven holes in the central 
darker circular area; in B two conspicuous pipes are marked 
WP. x70. Fig. 3. 
ip Lo: 
