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 
