18 On Ike Hiiiclun Formuhe 



tion had the properties of pure potash ; and when it had 

 been saturated with nitric acid it gave no tiirbidness by mix- 

 ture with sokition oF muriate of barytes : the acid matter 

 exposed to a strong heat evaporated without leaving any 

 residuum. 



[To be continued.] 



II. On the Hindoo Fnrmulce for compuirng Eclipses, 

 Tables of Sines, and various vlstronomical Problems, 

 By i\f. Delambke*. 



-L HESE formulas may be found in the second volume of the 

 Asiatic Researches, or Memoirs of tln' Society established 

 at Calcutta ; the two first volumes of which have lately been 

 translated into French, and published in 1S05 from the Im- 

 perial printing office. 



Although these formulae n)ust have been known in Eu- 

 rope for some time, yet as the original memoirs, printed 

 first at Calcutta, and since reprinted in London, are very 

 rare in France, we thouiiht it our duty to announce them 

 to our readers, many of whom, most likely, have not heard 

 of them. 



Ducham, Bailly, and Le Gentil, have mentioned that the 

 Indians possess methods of computing eclipses, which they 

 follow without understanding. Mr. Davis, the English au- 

 thor of this memoir, has attacked this assertion victoriously, 

 by giving at full length the compulation of the eclipse of the 

 moon of November 1789, by means of the Indian formulae, 

 of which he has given the demonstration and explanation 

 according to the Souria Siddanta. Want of room obliges 

 us to suppress these details ; observing merely, that we have 

 revised the compntaiious with attention, and that, excepting 

 a few points of the Indian doctrine, and a few suppositions 

 whose foundations arc not very intelligible, wecan declare that 

 all the rest are as clear as the composition of the subject will 



* From the ConnoUsavce ties Tanps for 1808. Translated by T.S.Evans, 

 F. L. S. — The ingenious method contained in this paper for computing 6V«ei, 

 aiid explained by M Dclambre, 15 curious, and will prove interesting to our 

 awronomical rcac'.crs. 



admit; 



