161 



The following Gentlemen were duly elected as Ordinary 

 Fellows: — 



1. Major Edward Madden, H.B.I.C.8. 



2. Dr James Watson, of Bath. 



3. Lieutenant Robert Maclaqan, Bengal Engineers. 



The following Donations to the Library were announced : — 



Memorie della Reale Accademia delle Scienze di Torino. Serie 2da- 



Tomo XII. 4to. — From the Academy. 

 Acta AcademifE Csesarese Leopoldino-Carolinse Naturao Curiosarum. 



Vol. XXIII., Pai's II. 4to. — From the Academy. 

 Transactions of the Linnjean Society of London. Vol. XXf ., Part 1. 



4to. 

 Proceedings of the Linnscan Society of London. Feb. 4, 1851, to 



March 16, 1862. 8vo. — From the Society. 

 Abhandlungen der Akadeniie der Wissenschaften zu BerUn. 1860. 



4to. — From the Academy. 



Monday, 17th January 1853. 

 Right Rev. Bishop TERROT, Vice-President, in the Chair. 



The following Communications were read : — 



1. On a simplification of the Instruments employed in Geo- 

 graphical Astronomy. By Prof. C. Piazzi Smyth. 



These instioiments include all of that smaller class employed by 

 travellers and navigators in determining latitudes and longitudes, and 

 in making surveys. 



At sea, the only instrument which can be employed, is some form 

 of the double-reflection instrument, as the sextant, or rather the re- 

 flecting circle ; and as this is able to compass all the requirements 

 which may be made of it there, great advantage will result in economy, 

 portability, and despatch, if it can be made also to serve the purposes 

 of a traveller by land. 



Hitherto, however, this has been accomplished but very ineffi- 

 ciently ; for with all the assistance of artificial reflecting horizons 



