 She was interested in distinguishing the different characteristics of her half-brothers and sisters from those of the children of her own mother.Barrington believed that the difference of characteristics must have been through the strain of blood and did not realise how important ancestry is in relation to heredity, only usually focusing on the importance of the parents.In "A First Study of the Inheritance of Vision and of the relative influence of Heredity and Environment on Sight, etc", Barrington reached out and used other people's memoirs to guide her study in this field.