CHAPTER XII 



CELL CONTENTS 



Cell contents, or substances resulting from the 

 activity of the protoplasm, may be classified accord- 

 ing to their chemical constitution and also according 

 to their structure or form. Classifications based upon 

 structure or form are better adapted to histological 

 work than those founded solely upon chemical char- 

 acters. The classification which follows is based 

 primarily upon structural characters, and chemical 

 differences are used as a secondary point in the 

 grouping. 



Cell Contents of Definite Form. 

 Colloidal Group : 

 Starch 

 Inulin 

 Aleurone 



Crystalline Group: 

 Sugars 

 Alkaloids 

 Glucosides 

 Calcium Oxalate 



Cell Contents of Indefinite Form. 

 Colloidal Group: 

 Tannins 

 Gums 

 Resins 



Fats and Oils 

 Silica Deposits 

 Calcium Carbonate Deposits 

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