There are two considerations appertaining to this subject, which,

although they do not belong to the physiology of the matter, deserve
to be mentioned in this connection
There are two considerations appertaining to this subject, which,
although they do not belong to the physiology of the matter, deserve
to be mentioned in this connection. One amounts to a practical
prohibition, for the present at least, of the experiment of the
special and appropriate co-education of the sexes; and the other is an
inherent difficulty in the experiment itself. The former can be
removed whenever those who heartily believe in the success of the
experiment choose to get rid of it; and the latter by patient and
intelligent effort.