Foreign Literature and Science. 173 



satellite, but never the 7th, which Herschell discovered, dur- 

 ing the disappearance of the ring. Schroter doubted the ex- 

 istence of this satellite." 



Relative to Jupiter, the observations of M. Struve, reduced 

 to the mean distance of the planet give him 



The equatorial diameter of Jupiter, seconds, 38.442 



Polar diameter, ----- 35.645 



whence results a flattenning of 0.078, or of T a? TT , the first 



diameter being taken for unity, 





Diameter of the first satellite, 



- seconds, 1.018 



second, 



0.914 



third, 



1.492 



fourth, 



1.277 



The third satellite has evidently the greatest diameter, while 

 it is very inferior in clearness to all the other satellites, and 

 sometimes appears very pale. The measurements were ta- 

 ken with an amplification of 540 and 600. 



Bib. Univ. Oct. 1826. 



1 8. Mutual Instruction in Denmark. — M. Abrahamson has 

 just'published his third annual report on the progress of mu- 

 tual instruction, (Copenhagen, 1826.) It is addressed to the 

 King, and brings up the statement to the 3d of December, 

 1825. It proves that the new method obtains the happiest 

 success in the Danish States. At the end of 1 823, the first 

 year of the foundation of schools of mutual instruction, there 

 were in Denmark, 244 schools completely organized. At the 

 end of 1824, the number rose to 605, and on the 31st of De- 

 cember, 1825, there were 1143 schools, in full activity, inde- 

 pendently of 564 others in which preparation was making 

 for the introduction of the system. It may then with certain- 

 ty be foreseen, that at the end of this year, (1826,) there will 

 be in Denmark, more than 1700 schools completely organ- 

 ized. — Rev. Ency. Oct. 1826. 



19. Separation of Iron from Manganese. — M. Quesneville, 

 fls, proposes to separate these metals from each other, by 



adding to their solution arseniate of potash, after having 

 rendered it as neutral as possible, and after having brought the 

 iron to the maximum of oxidation. The iron alone separates 

 in the form of arseniate, and the manganese remains in solu- 

 tion. — Jour, de Pharmacie. 



