Maturation of the Germ-cells 



do not balance one another, which are, so to 

 speak, not diametrically opposed to one another, 

 Mendel's law does not hold. A second im- 

 portant point is, that the dominance is in many 

 cases not nearly so complete as it should be if 

 the Mendelian formula correctly represented 

 what actually occurs in nature. Further, the 

 segregation of the gametes does not appear to 

 be so complete as the above hypothesis requires 

 it to be. The phenomena of inheritance seem 

 to be far more complex than the thorough-going 

 Mendelian would have us believe. 



Let it be noted that it is not to the facts of 

 Mendelism, but to some portions of what we 

 may call the Mendelian theory, that we take 

 exception. 



Before passing on to consider some of the 

 later developments of Mendelism, it is necessary 

 for us to set forth briefly certain of the more 

 important facts regarding the sexual act which 

 the microscope has brought to light. We 

 propose to state these only in the merest outline. 

 Those who are desirous of pursuing the subject 

 farther are referred to Professor Thomson's 

 Heredity. 



The germ cells, like all other cells, consist of 

 a nucleus lying in a mass of cytoplasm. The 

 nucleus is composed of a number of rod-like 

 bodies, which are called chromosomes, because 

 they are readily stainable. 



K 145 



