114 Mr. Gteeti's Observalioiis 



succession of hot days, at the latter part of the summer- 

 quarter, raised the average temperature above the corre- 

 sponding period of the first year, and rapidly brought on the 

 ripening of the grain. Nothing was now wanting, but a 

 favourable dry period to house the harvest. The reaping did 

 not begin till the 25th or 26th August, more than a fortnight 



later than the usual time. 



This summer must be reckoned altogether wet and cold, and 



owing to this, it is feared that the vintage on the Rhine, the 



Elbe, and in Switzerland, will entirely fail. 



The great characteristic features of the two years were, in 



the first, a cold winter and a hot summer; and in the second, 



a very mild winter, and a backward cold summer. 



ERRATA IN TABLE, Vol. X, p. 131. 



Column of Temperature, February, for 31 read 324 

 — 29 — 31 

 August, — 03 — 61 



Akt. XII. An Account of some Observations and Experi- 

 tnents made by Mr. Green, during his ascent in a BaUoon 

 from Portsea, on the 6th of September, 1821. 



[Communicated by R. H. Solly, Esq., F.R.S. and M.R.I.] 



Mr. Green has the merit of being the first person who has 

 tried experiments upon the buoyant powers of coal-gas. In 

 some of his preliminary trials, he ascertained that the ascensive 

 force of a small balloon three feet in diameter, when filled with 

 this air, was equal to eleven ounces, and when filled in the com- 

 mon way with hydrogen not more than fifteen ounces. He has 

 since made three voyages in a balloon filled from the street- 

 pipes, thereby reducing the expense of such ascents to a mere 

 comparative trifle. 



During his last ascent he made some experiments of much 

 interest to science, and which, as he has promised to repeat 



