Lunar Occultatiom for September and October. 



Bicarbonate of iron 0*40 



Common salt 13*13 



Sulphate of lime 9*58 



magnesia 8*49 



Silica 061 



Carbonaceous matter ..... 0*37 



159 



ELASTIC FLUIDS EVOLVED FROM VOLCANOS. 



M. Boussingault having examined the gases emitted from many 

 of the volcanos near the equator, has arrived at the following con- 

 clusions: — 



1st. That the elastic fluids disengaged from the volcanos near the 

 equator, are the same in the different volcanos ; viz. vapour of water 

 in great quantity ; carbonic acid gas, sulphuretted hydrogen gas, 

 and sometimes the vapour of sulphur. 



2ndly. That the sulphurous acid and azote, which are met with 

 in the craters of these volcanos, are to be considered as accidental 

 substances. 



3rdly. That muriatic acid, hydrogen and azote are not among the 

 gases disengaged from the volcanos at the equator. — Ann. de Chim. 

 et de Phys. tome lii. p. 5. 



LUNAR OCCULTATIONS FOR SEPTEMBER AND OCTOBER. 



Occidtations of fixed Stars by the Moon, visible at Greenwich in the 

 Year 1833. Computed by Thomas Maclear, Esq.; and circu- 

 lated by the Astronomical Society. 



%* The angles are reckoned/rom the northernmost point, and also from the ver- 

 tex, towards the right hand, round the circumference of the Moon's imago, 

 as exhibited in an inverting telescope. 



f Rising at emersion. 



