Plwtomicrognif'lis of Botauicdl Studies. 



39 



56. — T. S. Young Stem, " Pinus sylvestris," Common Pine. 



A 



Cortical tissue 



Bast elements. 



Cambium tissue. 

 Medullar)' ray 



' .'■''/y' Wood in development. 



''iKA- ' l^i'inifl^i'y ground tissue 



-^H^ 



57. — Advanced stage, Stem of " Pinus sylvestris," Common Pine. 



1 I^ /"'Vr \ '[ Developing brand 



''-\^ . *•■•.'" r'V'^^ H/ "' i' ' itlTO^ Phloem element 



Cambium. 



/ 



Wood, developing. 



Pith. 



