68 CELL INTELLIGENCE THE CAUSE OF EVOLUTION 



theories, as the units that make up the cell are too small 

 to be clearly seen by any microscope yet invented. 



It must be remembered that the cell organs that we are 

 able to see like the centrosome, nucleus, vacuole, chromo- 

 tophore and many others, are large crowds of these units 

 located at different places in the cell body to perform 

 special and different kinds of work. Some digest food, 

 some effect respiration, some move the body, some manu- 

 facture food, etc. As these crowds are divided up in the 

 cell to do different kinds of work, they look different. In 

 this way the cell has organs with which to perform its 

 different kinds of work, just as our bodies have organs to 

 effect different kinds of work. In reference to this, Wil- 

 son states : 



"Closely interrelated as the cell organs are, they have a 

 remarkable degree of morphological independence. They 

 assimilate food, grow and divide and perform their own 

 characteristic actions, like co-existant but independent 

 organisms of a lower grade than the cell, living together 

 in colonial, or symbionic association. Yet we may still 

 inquire whether the power of division shown by such 

 protoplasm masses as plastids, chromosomes, centro- 

 somes, nuclei, may not have its root in a like power resid- 

 ing in ultimate protoplasmic units of which they are made 

 up. On the strength of these facts Boveri concluded that 

 the chromosomes must be regarded as 'individuals' or 

 elementary organisms that have an independent exist- 

 ence in the cell. 



"The highest power of our present microscopes have 

 not laid bare the ultimate organization of the cell. The 

 cell might be composed of more elementary units ranking 

 between the molecule and the cell. 



"Whether the plastids arise solely by division or also 

 by new formation, the foregoing observations on the plas- 



