patient at one time, the young woman was, recollects being struck with
the resemblance, and noticed particularly that the hair had the
qualities characteristic of the negro."

Dr. Carpenter, in the last edition of his work on physiology, says it
is by no means an infrequent occurrence for a widow who has married
again to bear children resembling her first husband.

Various explanations have been offered to account for the facts
observed, among which the theory of Mr. McGillivray, V.S., which is
endorsed by Dr. Harvey, and considered (as we shall presently see) as
very probable at least by Dr. Carpenter, seems the most satisfactory.
Dr. Harvey says:

"Instances are sufficiently common among the lower animals where
the offspring exhibit more or less distinctly over and beyond
the characters of the male by which they were begotten, the
peculiarities also of a male by which their mother at some
former period had been impregnated. * * * Great difficulty has
been felt by physiological writers in regard to the proper
explanation of this kind of phenomena. They have been ascribed
by some to a permanent impression made somehow by the semen of
the first male on the genitals and more particularly on the ova
of the female:[11] and by others to an abiding influence exerted
by him on the imagination and operating at the time of her
connection subsequently with other males and perhaps during her
pregnancy; but they seem to be regarded by most physiologists as
inexplicable.

Very recently, in a paper published in the Aberdeen Journal, a
Veterinary Surgeon, Mr. James McGillivray of Huntley, has
offered an explanation which seems to me to be the true one. His
theory is that "_when a pure animal of any breed has been
pregnant to an animal of a different breed, such pregnant animal
is a cross ever after, the purity of her blood being lost in
consequence of her connection with the foreign animal, herself_
BECOMING A CROSS FOREVER, _incapable of producing a pure calf of
any breed_."

Dr. Harvey believes "that while as all allow, a portion of the
mother's blood is continually passing by absorption and assimilation
into the body of the foetus, in order to its nutrition and
development, a portion of the blood of the foetus is as constantly
passing in like manner into the body of the mother; that as this
commingles there with the general mass of