It supplies means of comparing the effects of nurture and nature; physiological signification of twinship; replies to a circular of inquiries; eighty cases of close resemblance between twins; the points in which their resemblance was closest; extracts from the replies; interchangeableness of likeness; cases of similar forms of insanity in both twins; their tastes and dispositions; causes of growing dissimilarity mainly referred to illness; partly to gradual development of latent elements of dissimilarity; effect of childish illnesses in permanently checking growth of head; parallel lives and deaths among twins; necessitarianism; twenty cases of great dissimilarity; extracts from the replies; evidence of slight exaggeration; education is almost powerless to diminish natural difference of character; simile of sticks floating down a brook; depth of impressions made in childhood; they are partly due to the ease with which parents and children understand one another; cuckoos forget the teachings of their foster-mothers.
HISTORY OF TWINS
From Inquiries into Human Faculty and Its Development by Francis Galton.
