A Possibility 107 



nucleus complete. If the two nuclei, reduced 

 to their lowest terms by the loss of the more 

 specialized parts, unite, they may not merge; 

 each may seek to complete itself through re- 

 generation. The two might then join in the pro- 

 duction of the lost parts, so that they would be 

 double in the parts retained, and single in the 

 restored parts. As the specialized parts are 

 the limbs and other accessories, the head, and 

 perhaps some of the internal organs, would be 

 double, while the motor organs would be new 

 and single. They would be the outcome of 

 the tendencies of both organisms and would 

 serve for both, the result being a double mon- 

 ster such as sometimes appears when the two 

 nuclei develop independently. Certainly an 

 analogy for such a combination is found in 

 the established cases of births possessing two 

 heads or bodies and one pair of limbs. If 

 through the inequalities of growth the one 

 nucleus grows more rapidly than the other, 

 the former will enclose the latter and throw 

 its envelope about it so that it cannot break 

 loose and assert itself. When the latter begins 

 to grow, it will distort and transform the outer 



