LECTURE XI. 



THE CELL THEORY. 



Prof. Oliver P. Jenkins. 



The cell theory is a conception of the nature of the 

 organization of plants and animals, which has been 

 the result of the gradual growth of ideas in regard to 

 the structure of organisms since the application of the 

 microscope to this study. 



The theory has been from time to time modified in 

 the light of a clearer understanding of the cell its 

 relationships, its minute structure, and its properties. 



Investigations and discussions now in progress in 

 regard to the minute structure of the cell and the in- 

 terpretation of its parts promise further greatly to 

 modify our conceptions of the organization of living 

 forms. 



Still the cell theory in its main outline represents the 

 present conception of the structure of organisms. It 

 forms a most valuable point of view from which to 

 consider the whole world of living forms, both from 

 the standpoint of structure (morphology) and from 

 that of activity and function (physiology). 



Statement of the Cell Theory. That the cell is the 

 unit of organization in both the plant and animal 

 world. 



All organisms consist of cells and cell-products. 



