Alrostation. i67 
7. Being near the ground, and oer a populous region in 
Jersey, the speaking trumpet produced echoes that might 
easily be mistaken for answers to the calls made in this man- 
ner for help i in landing. 
8. Mr. Robertson having landed the lady, again ascended, 
ata aarer ast 7 o’cloc -M. He carried one of Davy’s 
lamps, but the brilliancy of the stars rendered it unnecessary 
to use it, as he could by the eye distinguish the smallest 
ee on his instruments. 
9. Notwithstanding the loss of gas, which had been let off 
to facilitate the descent, the larger balloon, now eased of the 
weight of one person, had more ascensive power than the 
small ones, which therefore hung behind, and sometimes 
took a position exactly under the larger one : when the rapidity 
of ascent was diminished, the smal] balloons were much agi- 
tated—striking sometimes against the boat ‘and sometimes 
against the ballo atching his opportunity, when they 
approached, the scrote therefore ripped up two of them 
with the stabs of a knife; one had burst before, and one on- 
ly remained, which gave him no particular trouble. 
10. ans an elevation of more than 4000 feet, Fahr. ther- 
mometer was at 39°, the air was still and cain: and there 
were lenber" currents nor whirls, a fact easily ascertained by 
the use of a long pendant of thin animal membrane, fastened - 
to a silk six feet long, fixed to the boat, and which thus an- 
swered as for an aerial log or floater. This aerial log shows 
also, much more sensibly than the barometer, when the bal- 
loon is ascending or descending. 
11. At 40 minutes past 7 o’clock, the barometer had fallen 
to 16 inches and a few lines, and the thermometer of Faren- 
eo was 4° below freezing. 
. Then concentrated muriatic acid produced very little 
Paar toie in the air, thus indicating the silage ina Se 
measure, of water. The lips were very dry, and t he hy- 
ere indicated absolute dryness. 
t the altitude of 21000 feet, the thermometer of Fah- 
aca sail at 21, and caustic potash, which had been kept 
close in a glass_ bottle, with a ground glass stopper—when 
exposed to the air, remained perfectly dry, and was pulveriz- 
ed, without the hi hgituicast ci 
14. The Madgeburgh hemispheres, with a good vacuum, 
when the imate with the air was opened, were fill- 
