PI-ATE XXVII.— TANGENTIAL SECTIONS OF TRANSVERSE RESIN DUCTS. 



A-C, PiNUS T.EDA. I) iind K, p. PAiUSTKis. F, P. KciiiNATA. G, P. HKTEROi'ii YLLA. c. (/., resiu ilui-ts; /)•., trans- 

 verse tracheitis; p., parencliyma. 

 Magnification of originals, '■','"; of illustrations, '','<•. 



156 



