422 PHILOSOPHICAL TRANSACTIONS, [aNNO 1773. 



the causes that have contributed to the better health of our people. The 

 increase in population in Llanduvnan and Pentraeth parishes, has not been owing 

 to mines, or any new advantage introduced. The inhabitants are wholly 

 employed in husbandry. 



The numbers baptized and buried, in 5 parishes, for several periods, are as 

 below : 



Llansadurn Parish 



Baptized. Buried. 



from 1590 to 1 597 34 30 



from 1620 to 16'27 34 33 



from 1750 to 1757 63 ^. . . . . . 50 



i from 1764. to 177 1 69 '. . 6'8 



f from 1664 to 1671 69 188 



t. , tip u ) from 167 '.2 to 1779 IC2 ....-.■.:... ..•.■.106 



*!■ f enfaetu rnisn S from 1740 to 1747 iiiwv. wM>f,... 100.. . ..,,:,,,^ .,4,..,;. 85 



'1, : :,:,•..,( from 1764 to 1771 ... ,, . . . « 149 ' 80 



Llanwair yn ■lfroml732to 1739. .... .'...■.■. 68 67 



«3i • Geornwy Parish ' J from 1764 to 1771 . a^iJi^m :..>.. 19:1. •,:.. ,,,; 77 



\, .y,. /-from 16'7C to I(!83 ..-. .j., .V .. .„.. 155' 174 



: 'fieaumaris Parish .^ from l710to 1717 .'. .'.".'.'.. ...'•I'.. "236' ..; 212 



■kp-JXt tfrom 176+ to 1771 i/- rewjL'l . . 328 249 



I,. f from 1547 to 1554 .j .,»., «..,..•, .1., 3,0. ^. 39 



I. ^^ f P • ^ J from I620to 1627 .'1.' ■!'^.'^..^;l' 4'4i' .; \^.".'a',....6-7 

 UanddyfnanPanshj j.^^^,^5^,^^ 1757 .T. ...... lU. ..... ; 4ff - 



^! (_ from 1764 to 1771 154 108 



XX F. A Letter to the Rev. N. Maskelyne, F. R. {>.,from Mr. Bailly* of the 



h Royal Acad, of Sciences at Paris: Containing a Proposal 0/ some new 



.'. Methods of improving the Theory of Jupiter s Satellites. Translated from the 



V, French. To which are subjoined Notes on the same by the Rev. Samuel 



' Horsley. p. 185. 



Sir, Though I have not the honour of being personally known to you, I 



flatter myself, you will excuse the liberty I have taken, of communicating to you 



* This very respectable astronomer, John Sylvain Bailly, was born at Paris in 1736", and was cut 

 off in 1793, at 57 years of age. Early in life he showed a strong attachment to the sciences, and 

 while very young communicated some valuable memoirs to tlie Royal Acad., of which he was elected 

 a member in 1764. In 176'8 he published the Eloge of Leibnitz, for which he had the honour of 

 a gold medal from tlie academy of Berlin. This was followed by the Eloges of Comeille and 

 Lacaille, which, with the former, were collected together. In 1775 appeared tlie first volume of 

 his great and celebrated work, the History of Astronomy, the 4th and last volume of which came 

 out in 1779. Besides these principal works, he publi.shed several astronomical observations and 

 historical disquisitions. Mr. B. entered warmly into the convulsions of his native country, at the 

 cominencement of the revolution, and filled the critical office of president of the first national 

 assembly. On July 14, 1789, he was also chosen mayor of Paris; but soon lost his popu- 

 larity, owing to his enforcing obedience to the laws, and to the liberal sentiments he expressed for tlie 

 royal family. In consequence he resigned his office in 1791, and retired again to the calm pursuit 

 of the celestial sciences. But, in the sanguinary iieriod that followed, he was apprehended, and 

 after a summary process, condemned to be guillotined; which he suffered with firmness, the 12th of 

 November, 1793. 



