Erasmus Darwin wrote in 1801:
"The placenta is an organ
for the purpose of giving
due oxygenation to the
blood of the fetus; which
is more necessary, or at
least more frequently
necessary, than even the
supply of food."
Erasmus Darwin 1731-1802
Erasmus Darwin (1801) Zoonomia; or, The
Laws of Organic Life,
Section XXXVIII
http://www.blackmask.com/thatway/books180c/zoon.pdf
http://www.blackmask.com/thatway/books180c/zoondex.htm
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Notes
FNPS 2006