d, _Art of
Prolonging Life_, pp. 91, 206; Hammond's _Hygiene_, p. 116; _American
Journal of Medical Sciences_, July, 1865, p. 82; Francis Galton, _On
Hereditary Talent and Character_, in _Macmillan's Magazine_, vol. xii.
pp. 157, 318; Madden, _The Infirmities of Genius_, vol. ii. p. 107;
_Lancet_, December 22, 1868, p. 825; _The British Medical Journal_,
January 11, 1868, p. 25; Dr. Prosper Lucas, _Traite de l'Heredite
Naturelle_; Victor Hugo, _L'Homme qui Rit_, le seconde chapitre
preliminaire; Watson's _Practice_, p. 1153; Dr. Daniel G. Brinton,
_Guide-Book to Florida and the South_, Pt. iii.; Dr. J. V. C. Smith,
_Physical Indications of Longevity in Man._

P. 163. PLURAL BIRTHS.--Duncan, _Fecundity, Fertility, and Sterility_,
p. 69; Ramsbotham, _System of Obstetrics_, p. 461; _Philadelphia Medical
and Surgical Reporter_, vol. xix. p. 508, xx. p. 98.

P. 167. PREGNANCY.--Menville, i. p. 299; Dr. Gunning S. Bedford, _System
of Obstetrics_, p. 144 et seq.; Montgomery, _Signs and Symptoms of
Pregnancy_; Dr. Edward Rigby, _System of Midwifery_, p. 47.

P. 180. MOTHERS' MARKS.--See a very interesting article by Professor Wm.
A. Hammond, in _The Quarterly Journal of Psychological Medicine and
Medical Jurisprudence_, January, 1868, p. 1, in which he says, in
regard to the influence of the maternal mind over the foetus _in utero_:
'The chances of these instances, and others which I have mentioned,
being due to coincidence, are infinitesimally small; and though I am
careful not to reason upon the principle of _post hoc ergo propter hoc_,
I cannot--nor do I think any other person can, no matter how logical may
be his mind--reason fairly against the connection between cause and
effect in such cases. The correctness of the facts only can be
questioned: if these be accepted, the probabilities are thousands of
millions to one, that the relation between the phenomena is correct.'
See also Dr. J. Lewis Smith, _Diseases of Infancy and Childhood_, 1869,
p. 21; _Philadelphia Medical and Surgical Reporter_, vol. xix. p. 359.

Pp. 192-197. CONCURRENT PREGNANCIES.--Raciborski, _De la Puberte_, etc.,
p. 491; Dr. Gunning S. Bedford, _System of Obstetrics_, p. 442; _Dict.
des Sciences Medicales_, t. L. iii.; _Lancet_, August, 1856, p. 131;
Carpenter, _Human Physiology_, p. 779; Beck's _Elements of Medical
Jurisprudence_, art. 'Superfoetation;' Rokitansky, _Pathological
Anatomy_; _Philadelphia Medical and Surgical Reporter_, May 1, 1869, p.