7^ ^^^ 



^ 



i>7-r^ 



X^>:^ ^v- 



s. 



ring-stem of 

 lite medulla 

 aves) of the 



^^ ^^ ^ >^^^- 





/ 







^ ^3/3 > 



/^^3 ? ^7^ 



.<^ o/ 





^r7T^^±±y_o_ 



^rff-t>-^ a f ^ }" d> 



.^4 



/^-^^rro y t^ 4^y 



^rtrti / / % / ^\ 



,^OS^ 



,-^>/ 



■r 



6^^rD/ ^ 7^/? 3 



^^^^^^ / // S 5" 3 



,^^ 



;/^f 



^^z?^ i-viv^ '^^^ 





_^£rOf_ 



^7^ h f^ ^ ^/ 



of a lily. M, 



■lis are often 

 aving large 

 \. fig. 18). 

 stem loses 

 d, where it 

 wood and 

 3 cells pos- 

 lowever, is 



Structural 



jjrocesses 



; from the 



^Andles of a 



5t 3'ear of 



with addi- 



between 



al laj^er of 



tissue of 



~^.uch com- 



r size and 



M 



. M, pith ; 

 iber layers ; 



wiajjiimetnso aiameters, 



2e2 



