CAUSE OP HEREDITY 285 



mediately prepare to fight the disease. However, we find 

 that no "reaction," as they call it, takes place unless the 

 body cells have had some previous serious experiencc 

 with the particular germ injected. For instance, if a 

 person has been sick with tuberculosis, and never had 

 typhoid, the injection of dead typhoid germs will create 

 no disturbance in the body but the dead or live tubercu- 

 lar germs will do so, even fifty years after the disease was 

 cured. They remember their experiences fifty years back. 



I can remember how my consciousness had to direct 

 each finger when I first started to play the piano. Now 

 consciousness needs only give a hint as to what is wanted 

 and my nerve centers take full charge of the matter and 

 execute the necessary acts. If my consciousness should 

 be compelled to direct every detailed muscular act or 

 motion, nothing could be accomplished worth while. If 

 the judge in the district court had to look after the execu- 

 tion of all his orders and judgments, he would have no 

 time to do the judging and directing. If the cells of the 

 body did not all possess the power of memory, how could 

 they be instructed and trained to perform the different 

 acts required. 



The mind of any individual is entirely based on his 

 memory. All our ideas and conceptions are based upon 

 it, we could form no ideas or judgments without a past 

 experience to refer to. We know from the way the cells 

 are connected and in touch with each other, that what 

 one knows can easily be known by the others, if it should 

 be necessary to their business. We notice how they work 

 together in the case of sex instinct. The nerve centers in 

 charge of the business of perpetuating the race are able 

 to make the thinking cells connected with one's senses 

 or consciousness believe that a certain female is abso- 

 lutely indispensable to one's existence. The sex cells are 



