PART I. 



DESCRIPTIVE BOTANY. 



SECTION I. 



ORGANOGRAPHY AND GLOSSOLOGY. 



CHAPTER I. 



ELEMENTARY ORGANS AND TISSUES. 



EXTERNAL ORGANS CONSERVATIVE AND REPRODUCTIVE (9.). 



INTERNAL STRUCTURE ; ELEMENTARY TEXTURE ; CHEMICAL 



COMPOSITION (12.). ELEMENTARY ORGANS ; CELLULAR AND 



VASCULAR TISSUES (13.). COMPOUND ORGANS INVESTING 

 AND COMPLEX (28.). PRIMARY GROUPS OR CLASSES (S3.). 



(8.) Organs. THE various parts of which a plant is 

 composed have been called its " organs ;" and this term 

 is equally applied to those external portions, which may 

 readily be recognised as being subordinate to the whole, 

 such as its leaves, roots, flowers, &c., as to certain mi- 

 nute cells and vessels, of which its internal structure 

 consists. De Candolle has included every inquiry, both 

 into the external and internal organisation of plants, 

 under the title of " Organography ; " although such 

 details as belong to their external characters have a more 

 exclusive reference to our descriptive department, whilst 

 those which relate to their internal organisation are more 

 especially introductory to our physiological. 



(9.) External Organs. The principal external or- 



