497 



of abridgement, are reserved for the Philosophical Transactions, in 



which the paper will appear. 



" Ordnance Survey Office, 

 Southampton, June 29, 1858. 



" In the valuable communication by Archdeacon Pratt * On the 

 Effect of Local Attraction upon the Plumb-line at Stations on the 

 English Arc of the Meridian between Dunnose and Burleigh Moor,' 

 which is published in part 1. vol. cxlvi. of the Philosophical Transac- 

 tions, the data for the calculation are taken from vols. ii. and iii. 

 of the Trigonometrical Survey, which were published in 1811. Since 

 the publication of those volumes the triangulation has been extended 

 over the whole of the United Kingdom, new bases have been mea- 

 sured, and all the calculations have been revised ; and as consider- 

 able errors have been detected in the distances used as data by 

 Archdeacon Pratt, I directed Captain Clarke to substitute the cor- 

 rect distances in the formulae used by the Archdeacon, and recom- 

 pute the ellipticity and the amount of the local attraction at the 

 several stations. The accompanying paper contains the results ; and 

 you will see that we have simply made the numerical computa- 

 tions without presuming to alter the formulae employed ; in fact I 

 have considered it almost a duty on our part to supply the labour of 

 recomputation, the necessity for which was caused by the errors in 

 our first published volumes." 



"HENRY JAMES." 



" G. G. Stokes, Esq., Sec. R.S." 



November 30, 1858. 



ANNIVERSARY MEETING. 



The LORD WROTTESLEY, President, in the Chair. 



Mr. J. G. Jeffreys reported, on the part of the Auditors of the 

 Treasurer's Accounts, that the total receipts during the past year, 

 including a balance of 3627 5s. Sd. in the hands of the Treasurer, 

 amounted to J63864 15*. 3d. ; and the total expenditure during the 

 same period, including a balance of .=47 9s. due to the Society's 

 Bankers, amounted to .4048 Is. lie?., leaving a balance due to the 

 Treasurer of ^183 6*. Sd. 



The thanks of the Society were voted to the Treasurer and 

 Auditors. 



