“Some Freaks of Atavism” [HOUN]
"[T]he conversation...had roamed in a desultory, spasmodic fashion from golf clubs to the causes of the change in the obliquity of the ecliptic, came round at last to the question of atavism and hereditary aptitudes. The point under discussion was, how far any singular gift in an individual was due to his ancestry and how far to his own early training."
"But a terrible change came over our stepfather about this time. Instead of making friends and exchanging visits with our neighbours, who had at first been overjoyed to see a Roylott of Stoke Moran back in the old family seat, he shut himself up in his house and seldom came out save to indulge in ferocious quarrels with whoever might cross his path. Violence of temper approaching to mania has been hereditary in the men of the family, and in my stepfather’s case it had, I believe, been intensified by his long residence in the tropics."
"At the age of twenty-one he wrote a treatise upon the Binomial Theorem, which has had a European vogue. On the strength of it he won the Mathematical Chair at one of our smaller universities, and had, to all appearance, a most brilliant career before him. But the man had hereditary tendencies of the most diabolical kind. A criminal strain ran in his blood, which, instead of being modified, was increased and rendered infinitely more dangerous by his extraordinary mental powers.
“Good heavens!” I cried, in amazement.
The face of Stapleton had sprung out of the canvas.
“Ha, you see it now. My eyes have been trained to examine faces and not their trimmings. It is the first quality of a criminal investigator that he should see through a disguise.”
“But this is marvellous. It might be his portrait.”
“Yes, it is an interesting instance of a throwback, which appears to be both physical and spiritual. A study of family portraits is enough to convert a man to the doctrine of reincarnation. The fellow is a Baskerville—that is evident.”