which is more necessary,
or at least more frequently necessary, than even the supply of food.

The question of the great Harvey becomes thus easily answered. "Why is not
the fetus in the womb suffocated for want of air, when it remains there
even to the tenth month without respiration: yet if it be born in the
seventh or eighth month, and has once respired, it becomes immediately
suffocated for want of air, if its respiration be obstructed?"

For further information on this subject, the reader is referred to the
Tentamen Medicum of Dr. Jeffray, printed at Edinburgh in 1786. And it is
hoped that Dr. French will some time give his theses on this subject to the
public.

* * * * *

SECT. XXXIX.

OF GENERATION.

Felix, qui causas alta caligine mersas
Pandit, et evolvit tenuissima vincula rerum.

I. _Habits of acting and feeling of individuals attend the soul into a
future life, and attend the new embryon at the time of its production.
The new speck of entity absorbs nutriment, and receives oxygene.
Spreads the terminations of its vessels on cells, which communicate
with the arteries of the uterus; sometimes with those of the
peritoneum. Afterwards it swallows the liquor amnii, which it produces
by its irritation from the uterus, or peritoneum. Like insects in the
heads of calves and sheep. Why the white of egg is of two
consistencies. Why nothing is found in quadrupeds similar to the yolk,
nor in most vegetable seeds._ II. 1. _Eggs of frogs and fish
impregnated out of their bodies. Eggs of fowls which are not
fecundated, contain only the nutriment for the embryon. The embryon is
produced by the male, and the nutriment by the female. Animalcula in
semine. Profusion of nature's births._ 2. _Vegetables viviparous. Buds
and bulbs have each a father but no mother. Vessels of the leaf and bud
inosculate. The paternal offspring exactly resembles the parent._ 3.
_Insects impregnated for six generations. Polypus branches like buds.
Creeping roots. Viviparous flowers. Taenia, volvox. Eve from Adam's rib.
Semen not a stimulus to the egg._ III. 1. _Embryons not originally
created within other embryons. Organized matter is not so minute._ 2.
_All the parts of the embryon are not formed in the male parent. Crabs
produce their legs, worms produce their heads and tails. In wens,
cancers, and inflammations,