Ix^lV ADVERTISEMENT. 



had appeared refradory to it ; but, to employ the 

 terms ufed in an Introduâiion to the ftudy of 

 Aflronomy, an extradt of whicn was given in the 

 Mercury of the ift December 1787, No. 48, 

 *' This fatellite, which the celebrated Ualley called 

 *' an obftinate ftar, Siàiis pertimx, on account of 

 ** the great difficulty of calculating the irregulari- 

 *.' ties of her courfe, has been, at lafl:, reduced to 

 " fubjediion, by the ingenious methods of MeflVs. 

 " Clairault, Ruler ^ .D'alembert, de la Grange, and dti 

 *' la Placer 



Here, then, are the mod refradory fîars fub- 

 jeded to the Laws of attraction. 1 have but one 

 little objeclion to m.ak.e againft this domin ition, 

 and the learned methods, which have fubdued the 

 Moon's courfe. How comes it, that the recipro- 

 cal attrapions of the planets fhould have been cal- 

 culated with fo much precifion, by our Adrono- 

 mers, and that they fhould have fo exadly weighed 

 the mj-ifes of them, when the Planet difcovered a 

 tew years ago, by Herjchel, had not as yet been 

 put into their fcales ? Does this Planet, then, 

 at trad nothing, and does it feel itfeif no at- 

 traction ? 



God forbid that I fliould mean to injure the re- 

 putation of JSeii-îoHj and of the ingenious En- 

 quirers 



