The same fate has been meted out to that other venerable test of sex, the position of the air-bag at the blunt end of the shell.
This had been already prepared; and only needed to be attached to the bottom of the air-bag.
Four or five of the animals were tied together and drawn over by a man seated across an air-bag.
A sort of pipe is attached to this air-bag, which is played upon with both hands.
Our air-bag has to be emptied and filled so often that we cannot live under water long at a time, as a frog does.
One important part of the egg is the air-bag, placed at the larger end, between the shell and its lining membrane.
When the air has been changed to carbonic-acid gas, he must come to the surface to empty his air-bag and drink it full again.