106 



ORGANIC STRUCTURE. 



that of the seedling- already described, The second 

 shoot will be like that of the first in the second year, 

 viz. the pith, two layers of wood, and two layers of 

 liber, covered by the epidermis. And if we cut and ex- 

 amine the bottom, or first shoot produced by the seed, 

 we shall find it consist of the pith somewhat dimi- 

 nished, three layers of wood, and three layers of 

 bark, besides the epidermis. It is scarcely necessary 

 to add, that three seedling- plants raised together 

 afford proof of what has just been stated. 



The following are representations of transverse 

 and vertical sections of the seedling stem in the 

 first, second, and third year of its growth, 



Pis. 31. 



fill! 



First year magnified. 

 Fig. 32. 



