ON NINE BALLOON ASCENTS IN 1863 AND 1864. 



267 



Table III. (continued.) 



PiFTEENTH AsCENT. 



September 29. — On leaving the earth the temperature decreased from 48° 

 on the ground to 45^° at 1000 feet, and to 1° at 16,000 feet ; a warm current 

 having been met with between 12,000 and 13,500 feet. On descending a warm 

 current was passed extending from 14,000 feet to 9000 feet, and afterwards 

 the temperature iucreased constantly with decrease of elevation tUl the 

 ground was reached. 



