Note 41 — Chapter VIII · OF THE ORIGIN AND DEVELOPMENT OF THE ANIMAL LIFE.
F. Gold translation
It is unfortunate that Bichat makes use of the word density, as he seems to be ignorant of its true signification.
The resistance, which the womb offers to the fœtus that strikes against it, is wholly independent of density, and results only from the greater or less flexibility of its parietes. Cork is much less dense than mercury, and yet it offers to the finger, when pressed against it, a much greater resistance.