354 On the Lunar Cycle. 



parts of the country, have also been great : yet we believe them 

 to be fairly attributable to the neglect of universal vaccination, 

 and the partial but too frequent practice of small-pox inocula- 

 tion, 



J. LATHAM, M.D. President. 



Arthur Daniel Stone, ") ^ r ,. „ 



„ T> I Censors or the 



Robert Bree, I „ ^ n n«„„ 



„ T^ «/r > Royal College 



Edward 1 homas Munro, f . n\. • • «^ 



^ T 'r< ' I of Phvsicians. 



Geo. L. lUTHiLL. J 



David Dundas, 



Master of tiie Royal College of Surgeons. 



Thompson Forster,! >-. 



,;, Tj ' >Uovernors. 



Everard Home, J 



By Order of the Board, 



James Hervey, M.D. Registrar. 



LVI. O71 the Lunar Period. By Mr. Thomas Yeates. 



[In continuation from p. 89.] 



To Mr. Tilloch. 



Sib, — 1 OUR ingenious Correspondent's remarks on my papers, 

 page 14, are very curious, I must allow; but whether they apply 

 to the substantial parts of my argument I leave for others to 

 determine. My argument is the list of corresponding eclipses 

 which I have been at the pains to collect, and trust you will 

 allow me the credit of having advanced my hypothesis on some 

 foundation. It is true, I have filled up the list with many com- 

 puted dates, and ei-pecial!y from the learned and laborious com- 

 pilation entitled h'Art de verifier les Dates; but since these fill 

 up the steps in the ladder in their true places, and give a con- 

 sistencv to the whole, I presume little apologv may be required 

 for their introduction. These corresponding eclipses do certainly 

 give a limit to the lunar period, confirmed by all observation 

 ancient and modern, from the age of the Babylonian astronomers 

 to the present time: this period I have stated at 912 years, and 

 it matters not whether they are solar, lunar, Julian or sidereal ; 

 the argument is nevertheless valid, and appears to merit the 

 consideration of all those who cultivate the science of astronomy, 

 and especially the Lunar theory. See Catalogue of Ancient 

 Eclipses with the Dates of corresponding Eclipses at one and 

 two Periods Distance, vol. 55, p. 244 of Phil. Mag. 



In another paper, page 344, is attempted to show the verity 

 and precision of the ancietU historical eclipses by introducing the 



requisite 



