Page:The Works of William Harvey (part 2 of 2).djvu/3



��ON generation follows parturition, that process, viz. by which the foetus comes into the world and breathes the external air. I have, therefore, thought it well worth while, and within the scope of my design, to treat briefly of this subject. With Fabricius, then, I shall consider the causes, the manner, and the seasons of this process, as well as the circumstances which both precede and follow it. The circumstances which occur immediately previous to birth, and which, in women especially, indicate that the act of parturition is not far distant, are, on the one hand, such a preparation and arrangement on the part of the mother as may enable her to get rid of her offspring ; and on the other, such a disposition of the foetus as may best facilitate its expulsion.

With respect to the latter, viz. the position of the foetus, Fabricius says, 1 " that it is disposed in a globular form and bent upon itself, in order that its extremities and prominent points generally may not injure the uterus and the containing membranes ; another reason being that it may be packed in as small a space as possible." For my own part, I cannot think that these are the reasons why the limbs of the foetus are always kept in the same position. Swimming and moving about, as it does, in water, it extends itself in every direction, and so turns and twists itself that occasionally it becomes entangled in a marvellous manner in its own navel-string. The truth is, that all animals, whilst they are at rest or asleep,

1 De Form. Foe*, cap. ix, p. 40.

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