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The Descent of Man

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mammae (<strong>of</strong> course rudimentary) in the male<br />

sex <strong>of</strong> mankind; see 'Journal <strong>of</strong> Anat. and Physiology,'<br />

1872, p. 56, for a case given by Dr.<br />

Handyside, in which two brothers exhibited<br />

this peculiarity; see also a paper by Dr. Bartels,<br />

in 'Reichert's and du Bois-Reymond's Archiv.,'<br />

1872, p. 304. In one <strong>of</strong> the cases alluded to by<br />

Dr. Bartels, a man bore five mammae, one being<br />

medial and placed above the navel; Meckel<br />

von Hemsbach thinks that this latter case is<br />

illustrated by a medial mamma occurring in<br />

certain Cheiroptera. On the whole, we may<br />

well doubt if additional mammae would ever<br />

have been developed in both sexes <strong>of</strong> mankind,<br />

had not his early progenitors been provided<br />

with more than a single pair.<br />

In the above work (vol. ii. p. 12), I also attributed,<br />

though with much hesitation, the frequent<br />

cases <strong>of</strong> polydactylism in men and various<br />

animals to reversion. I was partly led to<br />

this through Pr<strong>of</strong>. Owen's statement, that some

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