Thus: 150 Miles. 3958 Miles in the Semidiameter of 150 3958 the Earth. ——— ———— 7500 31664 15 19790 ————— 35622 22500 11874 Square of the ———————— greatest visible 15665764 Square of the Semidiameter Distance. add 22500 of the Earth. ———————— Extract the sq. Root, 15688264 ( 3960.84 Square Root. 9 3958 subtract. —— ———— 69) 668 Rem. 2.84 Answer in Miles. 621 ——— 786) 478.2 471 6 ————— 79208) 6664.00 continued to 2 Decimals. 6336 64 ——————— 792164) 32736.00 ditto. 31686 56 ———————— 104944 To find the .84 Part of a Mile; multiply 1760 Yards in a Mile, Decimal Parts of a Mile to be reduced .84 into Yards. ———— 7040 14080 —————— 1760)1478.40(0 Subtract 1478 ———— 282 Answer: the Height of the Mountain is 2 Miles 282 Yards. [47] Rays flowing from the Sun seem to be +red orange+ or +yellow+, according to the Quantity of Vapours floating in the Atmosphere, which absorbs the most refrangible ones: and the fewer the Vapours the more does the Sun’s Light approach to a perfect and intense +white+, according to the Doctrine of Newton: which seems to receive Confirmation from the Purity of the Solar Light, when seen _above Clouds_ and _Vapours_, in the Balloon: where the Sun shines not so much with a _golden_ as with a _sparkling_ +silver+ Light. [48] +Sounds immediately under+ the Balloon, seemed, as if originated _near_ the Ear, and _louder_ than they would have been heard, at the Distance of some Yards _only_, when on a Level with themselves: augmenting rather than decreasing, during the _Ascent_ of the Balloon, till it arrived to a Height indicated by the Barometer at 27 Inches. Presently afterwards, the Balloon still rising; the Sounds _died away_: much sooner indeed than was expected. The like was observed in _descending_ from a State of perfect Tranquillity and Silence: _Sounds_ from _below_, when about the same Height, _suddenly rushing_ on the Ear. It must be considered that by _this_ Time, the +shadows+ were much encreased; tho’ at half past II, they were _more_ than double in Length to the Height of each Object.