Tables of the Pknei Fenus. 26 1 



aft it was also formerly near Egremont. This limestone does 

 not conform to the direction of the strata beneath it in a regular 

 order of succession ; but may be supposed to overlay and con- 

 ceal the bassetint^ out of many of the lower rocks. It dips each 

 way from the mountains, but with different degrees of inclina- 

 tion, the declivity being generally least on the southern side; ou 

 which account it is seen upon the surface to a greater extent, as 

 from Witherslack and Kendal, to Warton and Farlton Cragsrs', 

 and even as far as Kellet, before the commencement of the super- 

 incumbent sandstone belonging to the coal measures; (a remark- 

 able exception occurs at the foot of Holker Park, where the blue 

 rock is succeeded by limestone, and that by sandstone and shale, 

 indicating the beginning of coal measures ; all within a very short 

 distance;) while on tlie north and west of the mountains, from 

 the greater dip, and thinness of the strata, the slaty rock of the 

 first division is succeeded by limestone, freestone, and coal, all 

 within the distance of three or four miles. 



Keswick, Aug. 1, 1820. J, OtlEY. 



XXXIX. Tables of the Planet Fenus, includivg the Peritirba- 

 iinns,origirialh/ compiiled by Reboul, accordivg to the Tlieory 

 o/ Lahlack, and the Elements o/'Lindenau. Now arranged 

 in a more convenient Form, and adapted to the Meridian of 

 Greenwich. By A CouRiiSFONDiiNT. 



Xt is of greater importance to astronomy and navigation, that 

 we should possess correct Tal)les of Venus, than of any other 

 planet. Her motion is sufficiently rapid for the purpose of as- 

 certaining the longitude at sea, by lunar distances ; and although 

 this had been remarked several years ago, by Professor Reboul, 

 it is but recently that one or two continental astronomers have 

 begun to put this method into practice, by giving in their Ephe- 

 merides, the lunar distances from Venus, in like manner as from 

 the sun and stars. The fulfil uient of this end, obviou'^ly recjuires 

 the Tables of Venus to be of equal accuracy with those of the 

 Moon, which cannot be accomplished unless we apply the cor- 

 rections arising from the attractions of the other planets. 



The scarce and valuable Tables now first presented to the 

 ■British public, are, it is believed, the onlv ones in print, which 

 supply this desideratum : they were puljlished at Marseilles in 

 1811, and the form given to them is nearly that of Mayer's Solar 

 Tables; extending to 30 pages in (piarto. Some modification 

 was of course necessarv, to adapt these to an octavo impression ; 

 and, as considerable improvements have lately been made in the 



arrangement 



