(97 ) 



In case we may not have rendered the preceding 

 account of the structure and functions of vege- 

 tables sufficiently perspicuous, we have intro- 

 duced the following explanatory Table, a copy 

 of which ivas printed on cards, and distributed 

 at the time the Lecture was delivered. 



EXPLANATORY TABLE, 



REFERABLE TO THE 



PRECEDING LECTURE 



ON 



VEGETABLE PHYSIOLOGY. 



ANATOMY." "Description of each part of the structure of the plant. 



PHYSIOLOGY Treats of the functions and uses of each part. 



VEGETABLE CHEMISTRY Explains the primary elements of plants, 



consisting of carbon ; a small portion of nitrogen, one of the 

 constituents of the air; of hydrogen, one of the constituents of 

 water ; and of oxygen, which, combined with nitrogen, forms the 

 atmosphere, and with hydrogen, water. All these are variously 

 and chemically combined in the plant. 



AGRICULTURAL CHEMISTRY. A knowledge of the influence of the 



atmosphere on vegetation, and of the constituent parts of those 

 substances that contribute to the growth and increase of plants ; 

 including the different soils and the means by which they can 

 be improved. 



SIMPLE BOTANY. A classification and arrangement of plants, so as 



' to distinguish one from another. 



GENERAL PHYSICAL STRUCTURE OF PLANTS Originally only 



of two parts, viz. fibres or tubes for the conveyance of the sap ; 

 and a tissue of cells for the reception of the vegetable fluids. 



CAUDEX. -The main body of the root. 



RADICUL^. The ramifications, or smaller fibres of the root. 



EPIDERMIS, CUTICLE, OR OUTER BARK. The external covering 



of every part of the plan*. 



H 



