236 Scientific Intelligence. [March, 



that by comparison of the apparent motion, direction, and bearings, its 

 height above the earth can be estimated, I will endeavour, when I re- 

 visit the spot, to ascertain its relative bearings and apparent altitude 

 with greater accuracy ; as I can fix on the spot on the road from which 

 I viewed it, and also on the objects in the line over which I traced it. 



I am, Sir, your obedient servant, 



Richard Davenport. 



II. Analysis of the Ashes ejected from Vesuvius, during the late 

 Eruption. By Prof. V. Pepe, of Naples. 



In ten ounces of these ashes, which correspond to 6000 grains, there 

 are, according to this extraordinary analysis, 186 grains of saline sub- 

 stances, viz. 



Sulphate of potash 9j 



Sulphate of soda 44< 



Sulphate of lime 57 



Sulphate of magnesia 16 



Sulphate of alumina 14> 



Hydrochlorate of potash 9 



Hydrochlorate of soda 31 



180f 

 Loss 6* 



186 



Oxide of aluminium 1800 



Oxide of calcium 300 



Oxide of silicium 1200 



Oxide of magnesium 300 



Tritoxide of iron 1800 



Antimony 360 



Gold 131 



Silver 64 



5966 

 Loss 34 



6000 



However scrupulously the distinguished Professor has occupied 

 himself in the search of other substances, he has not been able to find 

 any more ! — (Giornale delle due Sicilie, Nov. 15, 1822.) 



III. Tutenag and White Copper of China. 



In the Annals for Sept. last, vol. iv. p. 236, we gave from No. 13 of 

 the Edinburgh Philosophical journal, Dr. Fyfe's analysis of the tute- 

 nag or white copper of China. In the original paper, Dr. F. com- 

 mences with some remarks on the very different statements which have 

 been made respecting the composition and origin of tutenag ; but it 

 now appears that these may have arisen from the circumstance, that 

 the two appellations have been applied promiscuously to two distinct 

 substances. In No. 15 of the Edinburgh Journal are some observations 



