1895.] Presents. 159 



data for a mathematical investigation of the earth's figure would be 

 obtained. 



In this way eight meridional arcs, extending from latitude 8 43' to 

 latitude 30 9', have been produced for India ; they rest on an average 

 of over sixteen stations for each of the fundamental latitudes, and 

 not, as usual, on one more station than the number of arcs. The 

 amplitudes of these arcs vary from 2 23' to 3 38', ranging in magni- 

 tude \vith the magnitudes of the mean ultimate local attractions, in 

 accordance with a rule which has been derived from the formula 

 which expresses the error of a geodetic arc in terms of the errors of 

 the major and minor axes. Two great longitudinal arcs, exceeding 

 24 in amplitude, have been produced by summations of the observed 

 smaller arcs, thus eliminating all errors caused by deflections of the 

 plumb-line at the intermediate stations, and retaining only those at 

 the eastern and western extremities of the entire arcs. 



These eight meridional and two longitudinal arcs are put forward 

 as the most valuable data for the investigation of the figure of the 

 earth which have yet been published. They are the result of opera- 

 tions which have been made in India during a period of over ninety 

 years, always with the cordial support and approval of the Govern- 

 ment of India. 



The Society adjourned over Ascension Day to Thursday, May 30. 



Presents, May 16, 1895. 



Transactions. 



Basel : Naturforschende Gesellschaft. Verhandlungen. Band X. 



Heft 3. 8vo. Basel 1895. The Society. 



London : British Museum. Catalogue of Printed Books. Pro 



Pue. Ric Ris. Rob Roe. Roe Rom. Rom Ros. 5 



Parts. Folio. London 1895. The Museum. 



Camera Club. Journal. Vol. IX. No. 108. 8vo. London 1895. 



The Club. 



Institution of Mechanical Engineers. Proceedings. 1894. 



No. 4. 8vo. London. The Institution. 



Royal Institution. Proceedings. Vol. XIV. Part 2. 8vo. 



London 1895 ; List of the Members, Officers and Professors. 



1894. 8vo. London. The Institution. 



Zoological Society. Report of the Council for the year 1894. 



1894. 8vo. London 1895. The Society. 



Manchester: Manchester Museum, Owens College. A Catalogue 



of the Books and Pamphlets in the Library. 8vo. Manchester 



1895 ; Report, from 1st October, 1890, to 31st December, 1894. 



8vo. Manchester 1895. The Museum. 



VOL. LVill. N 



