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Books Books 1 - 5 of 5 on ... likeness, and a few would greatly fall short of it. But this is not at all the....  
" ... likeness, and a few would greatly fall short of it. But this is not at all the case. Extreme similarity and extreme dissimilarity between twins of the same sex, are nearly as common as moderate resemblance. When the twins are a boy and a girl, they... "
Inquiries into human faculty and its development - Page 218
by Sir Francis Galton - 1883 - 387 pages
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The Journal of the Anthropological institute

Royal anthropological institute - 1876
...resemblance. When the twins are a boy and a girl, they are never closely alike; in fact, their origin is never due to the development of two germinal spots in the same ovum. I have received about eighty returns of cases of close similarity, thirty-five of which entered into...
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The North American Journal of Homeopathy, Volume 26

1877
...dissimilar ; twins of opposite sexes never being closely alike. In explanation of this fact, he says: "The word twins is a vague expression, which covers...the one corresponding to the progeny of animals that have usually more than one at a birth, and the other corresponding to those double-yolked eggs^ that...
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A Life of Sir Francis Galton : From African Exploration to the Birth of ...

Nicholas Wright Gillham James B. Duke Professor of Biology Duke University - Science - 2001 - 432 pages
...no more similar than brothers and sisters. Galton clearly recognized this distinction when he wrote: The word "twins" is a vague expression, which covers...the one corresponding to the progeny of animals that have usually more than one young one at a birth, each of which is derived from a separate ovum, while...
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Francis Galton: Pioneer of Heredity and Biometry

M. G. Bulmer - Biography & Autobiography - 2003 - 357 pages
...very instructive. He was familiar with the existence of two types of twins: "The word 'twins' . . . covers two very dissimilar events the one corresponding to the progeny of animals that have usually more than one young at. a birth, each of which is derived from a separate ovum, while...
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