The, mean Motions of the Sun and Moon, ^c. 347 



There are only two metals which have as yet presented 

 to the author more than two oxidations : these are tin and 

 lead : notwithstanding this, the quantity of oxygen in the 

 ox'idi: of t'm {ihchastoi' aurumimisivum) is not yet known, 

 nor that oF the oxide in the nitrate of lead which has been 

 boiled with plates of this metal. 



It seems that the different oxides of one and the same me- 

 tal may be intermediately dissolved, and form true combina- 

 tions. Thus the green oxide of cobalt is a combination of 

 blue and black oxide. 



May not minium be a combination of brown oxide and 

 of oxide at 9 in 100, and analogous to the foregoing? 



Finally; all the magnetic ores of iron and the attractable 

 sands arc mixtures or combinations of this order : if this were 

 not the case, what could prevent the minor oxide from rising 

 to the maximum P The oxide of the gun-barrel which has 

 served to decompose the water is also in the same case ; it is 

 formed of the two oxides. 



LXIV. The mean Motions of the Sun and Moon, of the 

 Sun's Perigee, the Moon's Perigee and A^ode ; the Times 

 cfflieir several Revolutions, both in respect to the Equinox 

 and to the fixed Stars, and in respect to each other: de- 

 duced from the New Tables of the Sun and Moon lately 

 published by the French Board of Longitude. By James 

 Epps, Esq, 



To Mr. Tilloch. 



SIR, 

 C 



*^HOULD you think the enclosed paper deserving a place ia 

 your Magazine, it is at your service. It contains the result 

 of very tedious though not difficult calculations; and, as it 

 exhibits^ an interesting view of the modern solar and lunar 

 astronomy, will, I think, prove acceptable to your astrono- 

 mical readers. 1 am, sir, yours &c. 



James Epps.* 



No. 4, Commercial Road, 

 May 14,1806. 



The 



