Plate XXVI. 



H Doc 181 



jCTt 



WSCHOLL 



Transverse Resin Ducts-Tangential Views 



t, a»t> .rn^™ fPeohinata &, P beterophylla rd ream ducts tr transverse traeheidb 

 4-C, Pinus t^da Z> and #, P PALUSTRIS F, P ECHINATA lr, r » 



MagnEt n ion y o?Wmals »f> f of illustrations *}° 



