378 Mr.Fareyonthe [May, 



tion made, and that it is marked at nine in the morning, at noon, 

 at three in the afternoon, and at nine at night. 



From the monthly mean of these heights, it appears that the 

 barometer is highest at nine in the morning, next highest at 

 nine in the evening, lower at noon, and lowest of all at three 

 in the afternoon. The proper hours, therefore, for taking the 

 heights of the barometer is nine in the morning, and at three in 

 the afternoon. 



The elevation of the barometer above the level of the sea 

 ought also to be noted when known ; and if a correction is made 

 for it in the results given, it should also be remarked, as some 

 meteorologists allow for it, while others are guilty of the 

 omission. I am, dear Sir, your humble servant, 



M. P. MOTLE. 



Article XI. 



Some Particulars regarding the Ashmolean Catalogue of Ertra- 

 neous Fossils, published in Latin by Mr. Edivard Luid (or 

 Llwt/d) ; and recommending a Translation of the same to be 

 made and printed. By Mr. John Farey. 



(To the Editor of the Annals of Philosophy.) 



SIR, Hotclaiid-strcct, March 29, 1 823. 



In pursuance of a design which I formed some years ago, of 

 collecting as many as possible of the published localities offossil 

 shells, and of other organic remains, in some instances, 1 lately 

 made an alphabetical arrangement of the 294 places, to which 

 Mr. Edward Luid (or Llwyd) seems to me to refer, in the second 

 edition of his descriptive Catalogue of the Ashmolean Museum at 

 Oxford, printed in 1760. This book I borrowed of my friends 

 Messrs. Sowerby, having, after many years inquiry, never 

 been able to meet with a copy of it on sale, from whence T 

 conclude that it is out of print, and become very scarce and 

 dear ; which circumstances induce me to request you to give 

 insertion in the Annals to a few particulars regarding Mr. Luid's 

 work, with the hope that the same may excite the attention of 

 the collectors offossil shells, Sec. and prove of some use to them, 

 and may lead to the publishing of an English edition of this 

 work, by some gentleman connected with the University ; 

 wherein I hope, that the copper plates to Mr. L.'s book are pre- 

 served, and might serve for a cheap English edition. 



The specimens of organic remains, Sec. mentioned, and briefly 

 described, by Mr. Luid, including some sparry substances at the 

 beginning, seem about 1800 in number; 1766 of which speci- 

 mens are distinguished by a series of numbers, and some others 



