I go HEREDITY AND EUGENICS 



same sports, but differ in their mathematical tastes 

 and in their gait. One was left-handed as a child, 

 but their writing is strikingly alike, and they both 

 have the same peculiarity of the left thumb joint. 

 They differ in application and in nervousness. This 

 is a striking combination of similarities with minor 

 differences and an unaccountable left-handedness 

 in one. 



Still another pair of men of fift3^-nine show less 

 identity of feature, but similar gait and bodily 

 weaknesses, the same dislike for strawberries and acid 

 foods, and a congeniality for each other which appears 

 to be characteristic of identical twins . But their ocular 

 defects pertain to the right eye in one and the left eye 

 in the other, and their handwTiting is not strikingly 

 similar, though showing marked resemblances. 



Popenoe (1922) has recently described a case in 

 which twin girls were reared separately and have led 

 very different lives yet maintain their physical and 

 mental identity. The mother died, and they were 

 separated at the age of eight months. They did not 

 see each other again or correspond until they were 

 eighteen, and have only been together for about ten 

 months in all their lives. One married and taught 

 in a school, the other travelled and has followed 

 a business career in various parts of the country. 

 Yet they remain of exactly the same height and can 

 wear each other's clothes. Their hair and voices are 

 the same and people cannot tell them apart. They 

 even both had their hair bobbed at the same time, 

 each without the other knowing it. Their intellectual 

 capacities appear to be very similar, as well as their 

 tastes. Like many twins, their illnesses also usually 

 came at the same time. Here is an excellent example 

 showing the overpowering importance of nature, 

 and the insignificance of environment and experience 

 m producing differences. 



