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VEGETABLE PHYSIOLOGY. 



CHAPTER I. 



STRUCTURE AND PROPERTIES OF VEGETABLE 

 TISSUE. 



1. 



T7EGETABLE Structure " chemically 

 composed of oxygen, hydrogen, and car- 

 bon, to which nitrogen is always superadded," * 

 consists, in common with that of all organized 

 beings, of 



1. The matter which forms the actual sub- 

 stance of the plant itself. 



2. One or more liquids, either contained 

 in, or secreted by, its organs. 



3. Other substances, more or less solid, 

 deposited during the passage of those liquids 

 through the different portions of the body. 



The researches of modern investigators, aided 

 by the improved powers of the microscope, have 



* Lindley's Elements of Botany, p. 1. 



