OBSERVATIONS AND DEDUCTIONS 29 



(c) The absence of dominance. 



(d) Polygamy, or the mating of a factor with more 

 than one other. 



(e) The coupUng or tying together of two or more 

 factors so that they are handed on from generation to 

 generation as one. 



(/) The production of similar or closely similar effects 

 by different materials. 



As the foregoing discussion of Mendel's work should 

 be a sufficient introduction to any case in which the 

 characters are distributed in a normal manner, we shall 

 now give attention to cases in which the distribution is 

 not normal. We shall select a few examples to illustrate 

 the different kinds of abnormality, and, as our object 

 is to make each abnormality as clear as possible, we 

 shall select such examples as suit best for this purpose 

 without regard to their importance from any other point 

 of view. 



