ANATOMY AND PHYSIOLOGY 



PLANTS. 



1. To set aside all difference of opinion with respect 

 to the definition of a plant, we shall consider vegetables 

 as organized bodies, consisting of solid and fluid parts ; 

 and possessing certain functions and properties here- 

 after to be explained. 



In the following pages, we shall therefore have to show the gene- 

 ral nature of the vegetable organization, whereby we shall learn, 

 that both the solid and fluid constituents are under the influence of 

 a living principle ; that the solid parts frequently change their struc- 

 ture; that the fluid parts, often differ widely in chemical properties, 

 and are not only retained within certain vessels, but are constantly 

 undergoing certain alterations resulting from a specific action of the 

 solids or other causes. We shall, also have to enumerate other 

 circumstances more or less immediately connected with the subject. 



ON VEGETABLE SOLIDS. 



Under the solids we must investigate the structure 

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