and there is no common passage,

but the passages through their
having a common wall receive the breath and pass it on to the heart;
and one of the passages conveys it to the right cavity, and the
other to the left.

With regard to the great vein and the aorta we shall, by and
by, treat of them together in a discussion devoted to them and to them
alone. In all animals that are furnished with a lung, and that are
both internally and externally viviparous, the lung is of all organs
the most richly supplied with blood; for the lung is throughout spongy
in texture, and along by every single pore in it go branches from
the great vein. Those who imagine it to be empty are altogether
mistaken; and they are led into their error by their observation of
lungs removed from animals under dissection, out of which organs the
blood had all escaped immediately after death.