Aërial Scenes _described_, 39, 47, 51, 56 Air gives +form+ to _Things_, 53 - _gentle_, its Effect on the _Surface_ of the Balloon, 201 - _calm_, its _Effect_ on the _Surface_ of the Balloon, 202 - _pure_, cool, defloguisticated, perpetually descending, 252 - _descending Torrents_ of, on Etna and Teneriffe, 265 - _Reception and Dispersion of_, what, 280 Air Bottle Balloon, _its Use_, 311 - - - _preferred_ to an _interior_ Balloon, 314 Aironaut _Employments_ of the, in the Balloon, 29 - - _Attitude_ of the, in the Balloon, 32, 33 - - _lost over a Country_ well-known when _below_, 177 - - to _try_ different Heights, to find a _favorable Wind_, 309 - - to _wait_, in the _Calm above_ the Clouds, for a _Wind_, 309 Airostat, a small one _first_ liberated, 8 Altitude _apparent_, from the Balloon when _stationary_, 49 - - _barometric_, 49, _b_. Anchor and Cable, 13 Apogay Winds, what, 241 Apparent Height _proportioned_ to the _barometric_ Height, 49 Appearance of a Plain _below_, the Size of a moderate Carpet, what, 179, 189 Appearance of a Plain _below_, the Size of a Handkerchief, what, 181, 187 Appearances at _different_ Altitudes, _from the Balloon_, 213 Articles, _Weight_ and _Number_ of, 26 Ascent, to _check_ and _promote_, 14 - - _Preparations_ for, 22 - - of the Balloon at 40 Minutes past I. o’clock, 28 - - with _twenty Pounds_ of _Levity_, 28 - - of Balloons, Causes to _limit_ the, 279 - - _proper Times_ for, 285 - - _new_ Mode of, to _determine_ the _Height_, 299 Atmosphere _gross_, when seen throu’, _from below_, 55 - - Depression of the, 232 - - State of, _favorable_ to the _Direction_ of Balloons, 268 - - Conjectures concerning the _Warmth_ of the _superior_, 275 - - probably _respirable_ at _great Altitudes_, 277 - - _Height_ of, 290 - - _Weight_ of, in _England_, 290 Attention to the Balloon _necessary_, 35 Aurora Borealis, Conjectures concerning _Appearance_ of, 274 B. Ballast of what it consisted, 27 - - when to be _first_ thrown out, 21 - - in Hand, ready to throw out, 91 - - thrown down, 67, 95 - - thrown over _nearly_ 32 Pounds, 103 - - poured down at once 20 Pounds, 183 Balloon going to Sea, 75, 87, 90 - - in a quiescent Bed of Air, 75 - - of rowing it to any Point, in a Calm, 75 - - drawn aside out of the Perpendicular, 103 - - shrunk to its former Shape, 123 - - alternately rising and falling, 125, 138 - - in the Air five Hours and a Quarter, 207 - - sustained above Water, how, 294, 295 - - best Form of, 307 - - Double, what, 314 Balloons their Defects, and further Improvements, 303 - - Air-tight Varnish for, 320, 325 Barometer, and Thermometer, when stationary, 36 - - Fluctuation of the Quicksilver in the, 37 - - Mensuration of Heights by the, 350 Beautiful preferred to the Sublime, in Prospects, 42 - - Appearance, 43