Proceeding to the evidence for the transmissions of acquired habits,
I will quote two recently adduced examples from among the many that
have been credibly attested. The first was contributed to Nature
(March 14, 1889) by Professor Marcus M. Hartog, who wrote:--
"A. B. is moderately myopic and very astigmatic in the left eye;
extremely myopic in the right. As the left eye gave such bad images
for near objects, he was compelled in childhood to mask it, and
acquired the habit of leaning his head on his left arm for writing,
so as to blind that eye, or of resting the left temple and eye on
the hand, with the elbow on the table. At the age of fifteen the
eyes were equalized by the use of suitable spectacles, and he soon
lost the habit completely and permanently. He is now the father of
two children, a boy and a girl, whose vision (tested repeatedly and
fully) is emmetropic in both eyes, so that they have not inherited
the congenital optical defect of their father. All the same, they
have both of them inherited his early acquired habit, and need
constant watchfulness to prevent their hiding the left eye when
writing, by resting the head on the left forearm or hand.
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