CAUSE OF HEREDITY 271 



blood stream at any time or to any point or part of the 

 body, and take note of this or that, just as the other white 

 cells do now, who are the soldiers and general inspectors 

 of the body. When we consider what the cell really is, 

 that he is in fact a colony of beings, that half of him has 

 the experience of ages and the other half of his crowd has 

 the experience of the last body he occupied he should be 

 very well informed indeed. You see, however, that this 

 knowledge must necessarily be limited to those bodies or 

 structures from which he came. The world in which he 

 lived was the body of the plant or animal from which he 

 came. 



We might investigate here a little further into the de- 

 tails of how the cell multiplies and grows. We do not 

 know how he grows but we know how he multiplies. He 

 simply divides himself into two parts, then these two 

 halves again grow back to full size, and then these again 

 divide into two and so on. Figure 41 illustrates the way 

 he looks through the most powerful microscope now 

 made. He has a great number of special organs, the pur- 

 pose of which we do not yet understand. We do know 

 that he has a centrosome acting like a general superin- 

 tendent, which looks after the division of the individual 

 cell and sees to it that the division is exactly equal, as far 

 as the central part of the body or head is concerned. This 

 central head is called the nucleus, and seems to be made 

 up of a crowd of separate individuals called granules, 

 which are no doubt the living primordial beings that make 

 up the cell because they move about in obedience to the 

 orders of the centrosome. The centrosome seems to be 

 the main head or directing center, the general manager, 

 and the nucleus seems to contain the sub-managers, or 

 skilled workers, and the body or cytoplasm, as it is called, 



