The spores are inclosed in these sacs, usually eight in a sac.
This sac later divides into two, and develops into the lungs of the animal.
The Serpent is converted into a sac, holding up the rain-waters.
If the sac then is not to be opened, the rest of the operation is very simple.
It is not at all necessary in every case to open the sac of the peritoneum.
If the sac ...