Chapter XXXXI

CONJECTURES ON THE CAUSES WHICH INFLUENCE THE DESCENT OF BALLOONS
IN THEIR PASSAGE OVER WATER.

[Sidenote: Recapitulation of Facts.]

1. Conjectures concerning the regular Tendency of the Balloon to _descend_ on its _Approach_ towards +water+.

2. Its _greatest_ Descent, when in the Zenith, over the Middle of Rivers.

3. Recovery and _Re-ascent_ to the former Level, as it _recedes_ from them.