Otto Weininger,
Sex & Character
(1906)
“ It is a practical rule with surgeons that when a dangerous loss of blood has to be made good, the blood required for transfusion must be obtained from an individual not only of the same species and family, but also of the same sex as that of the patient. The parallel between transfusion and transplantation is at once evident. If I am correct in my views, when surgeons seek to transfuse blood, instead of being content with injections of normal salt solution they must take the blood not merely from one of the same species, family and sex, but of a similar degree of masculinity or femininity. ”
