40 



PliDto'iiicninriiphs of Batiinical Studies. 



58. — L.S« Advanced Stage of Stem, " Pinus sylvestris." 





Pf!-' 









Cortex. 



Wood. 

 Cambium. 



'■/•••/ 



■r^/o 





Pith 





i^ Developing 

 . "^ '; branch. 



59. — T.S. Resin Passage of Stem, " Pinus sylvestris." 



Nuclei. 



.Thickening band of 

 prosenchyma. 



Secreting cells of resin 

 passage. 



