14. History of Aerostation.

" &c. As if there had been some lamp," or other fire, within it, which might" produce such a forcible rarefaction astc should give a motion to the whole" frame.

** But this may be better performed by" the strength of some such spring as is" commonly used in warches. This ipring" may be applied unto one wheel, which" shall give an equal motion to both the" wings; these wings having unto each of" them another smaller spring, by which" they may be contracted and lifted up:“ so that being forcibly depressed by the“ strength of the great and stronger spring," and lifted up again by the other two;“ according to this supposition, it is easy" to conceive how the motion of flight" may be performed and continued.”

In his 7th chapter he enumerates fourdifferent ways whereby dying in the airhath been or may be attempted; namely:1. by spirits or angels; 2. by the help

of