366 PLATES. 



Fig 3. 



GERMINATION OP A DICOTYLEDON, OR EXOGENOUS 

 PLANT. 



Daubnentonia punica. 



a, Radicle slightly branching. 



6, Neck or vital point between the root and 



the stem. 



, Portion of the stem below the cotyledons. 



T, Portion of the stem above the cotyledons, 



c c, Two opposite cotyledons, 



d, A simple primordial leaf, 



//, Common leaves. 



Fig. 4 



VERTICLE SECTION OF THE STEM OF A DICOTYLE- 

 DON, OR EXOGENOUS PLANT. 



The Oak. 



a 6, The bark, composed of the verticle layers a, 



and the internal bark b. 

 c d e, The wood, composed of the alburnum or 



young wood, c, the perfect wood d, and the 



pith e. 

 The circular zones represent the layers of 



wood, and the lines diverging from the 



centre the medullary rays. 



Pig. 5. 



A BRANCH TURNING ITS LEAVES TOWARDS THE 

 LIGHT. 



