273 



REPORT — 1864. 



decreased more rapidly in the next 600 feet, and remained nearl}' stationarj^ 

 during the following 900 feet, it being at 5000 feet rather more than 42°. 



On descending it slightly dedined in the first 300 feet, then increased slowly 

 till 2000 feet, after which it was nearly stationary till within 400 feet of the 

 earth, where it was 49°. 



On reascending it declined very slowly till 4000 feet was attained, it being 

 then 46°, after which it became too dark to read the thermometers ; this was 

 a matter of great regret, for the balloon passed above 6000 feet ; the tempera- 

 tare was found to be 46g° on the ground. 



Table III. {continued.') 



TWENTY-SECOXD AsCENT. 



August 29. — On the ground the temperature of the air was 72^° ; on as- 

 cending several warm and cold currents were passed through ; the tempera- 

 tm-e was 33° on reaching the highest point, viz. 15,000 feet ; on descending 

 the increase of temperature to 14,000 feet was as much as 4°, having en- 

 tered a cold current which continued till 9000 feet was passed ; from 8000 

 feet the increase of temperature was very regular, and continued so till the 

 earth was reached. 



