BORN AT THE SAME TIME BUT OF DIFFERENT SEX 



Fraternal twins — like Merton and Myrtle Collins — are not more alike than if they had 

 been born a year or two apart. Merton has blue eyes and fair hair and is near sighted, 

 while Myrtle is dark with dark brown eyes and good eyesight. Except in mathematics 

 their abilities are about the same, and they have quite similar likes and dislikes. They are 

 unusually fond of each other. No cases of identical twins are known in which they differ 

 in sex nor are such conceivable as our knowledge of heredity stands today. (Fig. 12.) 



