[ 12 ] 
Presents. 
PER RE Y (Alexis.) Trois Memoires sur les Tremblements de Terre dans le 
Bassin du Rhin, la peninsule Italique, et dans la peninsule Turco-Helle- 
niqne et en Syrie. 4to. 1846—8. 
PLANTAMOUR (E.) Resume Meteorologique de I’Annee 1849, pour Ge- 
neve et le Grand St. Bernard. 
PLATEAU (J.) Sur de Nouvelles Applications curieuses de la persistance 
des Impressions de la Retine. 8vo. Bruxelles. 
POLLOCK (J.) On the Action upon the Galvanometer by Arrangements of 
Coloured Liquids in a U-tube. 8vo. London 1850. 
PORTRAITS 
Portrait in Oil of the late Sir John Barrow, Bart., F.R.S. 
Engraved Portrait of Sir Isaac Newton, from the Pepysian Collection, Cambridge. 
Lithographed Portrait of Rev. W. Kirby. 
PRICE (B.) A Treatise on the Differential Calculus, and its Application to 
Geometry. 8vo. London 1848. 
An Essay on the Relation of the several Parts of a Mathematical 
Science to the Fundamental Idea therein contained. 8vo. Oxford 1849. 
QUETELET (A.) Notice sur Henri-Chretien Schumacher. 8vo. Bruxelles 
1851. 
— — Sur le Climat de la Belgique. 4“® Partie. 4to. Bruxelles 
1851. 
Annuaire del’Observatoire Royal deBruxelles 17“®etl8“®. 
Annee 1850-1. 
Rapport sur I’Etat de I’Observatoire Royal de Bruxelles 
pendant 1849. 
REEVE (Lovell.) Conchologia Iconica. Monographs of the Genus Acha- 
tinella — Artemis — Fissurella — Lucina — Partula. 4to. London. 
RENNIE (Sir John.) The Theory, Formation and Construction of British and 
Foreign Harbours. Part I. to VII. fob London 1850. 
RENNIE (G.) Report on the Supply of Water to be obtained from the 
district of Bagshot. 4to. London 1 850. 
RITTER (Carl.) Die Erdkunde von Asien. Band 8. Palastina und Syrien. 
8vo. Berlin 1850. 
Ueber raumliche Anordnungen auf der Aussenseite des 
Erdballs. 4to. Berlin 1850. 
RIPAULT (M.H.) Determination de la Figure connue sous le nom d’Ascia, 
que I’on voit sculptee sur les Tombeaux anciens. 8vo. Dijon 1851. 
ROWLANDSON (T.) Report made to the Governor and Company of the 
New River. 8vo. London 1851. 
RUDHART (Dr.) Einige Worte liber Wallensteins Schuld. 4to.ilfi<wcAe?G850. 
RUSH (G.) An Account of Ascents in the Nassau and Victoria Balloons, in 
the years 1838, 1849 and 1850. 8vo. London 1851. 
SABINE (Lieut.-Col. E.) Observations on Days of unusual Magnetic Dis- 
turbance, made at the British Colonial Magnetic Observatories. 4to. Lon- 
don 1851. 
Observations made at the Magnetical and Meteoro- 
logical Observatory at Hobarton. Vol. I. 4to. London 1850. 
Donors. 
The Author. 
The Author. 
The Author. 
The Author. 
J. Barrow, Esq., F.R.S. 
Rev. J. A. Edleston. 
W. Spence, Esq., F.R.S. 
The Author. 
The Author. 
The Observatory. 
The Author. 
The Author. 
The Author. 
The Author. 
The Author. 
The Author, 
The Academy of Sciences, 
Munich. 
The Author. 
H.M. Government. 
