OUTLINES OF NATURAL PHILOSOPHY. 



des Equinoxes, Paris, 174-9. A solution equally 

 correct and original, was given about the same 

 time by EULER, Mem. Acad. de Berlin, 1749. 



Two solutions, in the Philosophical Transactions for 

 1754 ancj 1756, continued to follow the method of 

 NEWTON. The first of these was by SYLVABELLE,' 

 the second by WALMESLEY ; and this last, though 

 it retained both the defects just mentioned, is re- 

 markable for the elegance of the demonstrations. 

 It extended the problem to the nutation of the 

 Earth's axis, and it treated of the diminution of 

 the obliquity of the ecliptic by the action of the 

 planets. 



A memoir by LA GRANGE, on the Libration .of the 

 Moon, which was crowned by the Academy of Sci- 

 ences at Paris in 1769, contained an excellent so- 

 lution of the problem of the Precession. 



SIMPSON, in his Miscellaneous Tracts, has given the 

 solution already referred to, which is one of great 

 simplicity and correctness. Its only defect is, that 

 it does not clearly point out the means by which 

 the uniform inclination of the Earth's axis is main- 

 tained. 



Another very elegant solution, is that of FRISI above 

 referred to ; Theoria Diurni Motus, Opera, 

 torn. in. p. 292, 



LA LANDE has followed SIMPSON, as has also VINCE, 

 in his Astronomy. The latest solution is that of 

 Professor ROBERTSON of Oxford, Phil. Trans. 



1807; 



