Il8 MAN, — THE ANIMAL 



of growth. They do not migrate into the germ 

 cells from all parts of the body. 



There is no question about the facts of heredity 

 and that the parental characters reappear in the 

 offspring as unit characters and that one character 

 usually is so prominent that it completely obscures 

 or prevents the weaker from appearing. But as 

 soon as we pass over into an explanation of how 

 unit characters are transmitted or why they fre- 

 quently are united in pairs, i.e., the tall pea might 

 have yellow seeds and the short pea green seeds 

 and the two characters, length of stem and color 

 of seed, be transmitted together, we pass into the 

 theoretical. Various hypotheses have been formu- 

 lated about heredity. Such a proceeding is neces- 

 sary in order that the experimenters may have a 

 definite problem to solve. They either confirm or 

 disprove the hypothesis. The fact that many 

 hypotheses of science have been discarded is taken 

 by those who do not understand the scientific 

 method as an evidence of weakness, when it is 

 really only the method of procedure. The real 

 difficulty arises in the masses of people trying to 

 accept the various working hypotheses of science 

 as final explanations. We shall have many more 

 hypotheses about heredity as we become more 

 skilled in analyzing this phase of living proto- 

 plasm. 



