ORB—ORT 381 
Orbigny (Charles d’). Classification et principaux caractéres minéralo- 
giques des roches d’aprés la méthode de M. Cordier. (Tract.) 
Svo. Paris, 1848. 
—. Description sommaire des divers terrains qui constituent. l’écorce 
terrestre. (Tract.) 8vo. Paris, 1849. 
and Gente (A.). Géologie appliquée aux arts et 4 agriculture. 
8vo. Paris, 1851. 
—. Description des roches. 8vo. Paris, 1868. 
——. See Huor(J.J.N.). 
Ordinaire (C. N.). A Natural History of Volcanoes. Translated from 
the original French manuscript, by R. C. Dallas. 8vo. London, 1801. 

—. Histoire naturelle des volcans. 8vo. Paris, 1802. 
Ordnance Map of Scotland. Remarks on the scale adopted. (Tract.) 
Svo. No date. 
Ordway (Albert). On the supposed identity of the Paradowides Harlani, 
Green, with the Paradowides spinosus, Boeck. (Tract.) 
Svo. Boston, 1861. 
O’Riley (Edward). Journal of a Tour to Karen-Nee for the purpose of 
opening a trading-road to the Shan traders from Mobyay and the 
adjacent Shan States, through that territory direct to Toungoo. 
(Tract.) 8vo. 1857. 
——. A brief notice of the Tenasserim Provinces in relation to their 
Commercial and Political Importance. (Tract.) 
8vo. Bassein, 1862. 
Orlebar (A. B.). Some observations on the Geology of the Egyptian 
Desert. (Tract. Svo. Bombay, 1845. 
Ormerod (George Waring). On the Geology of Central Cheshire. (Tract.) 
Svo. London, 1848. 
—. On the Salt Field and New Red Sandstone of Cheshire. (Tract.) 
8vo. Manchester, 1848. 
—. Remarks on a line of Earthworks in the parish of Lidenham, 
Gloucestershire, known as “ Offa’s Dyke.” Ato. London, 1859. 
—. On the traces. of Tin-streaming in the vicinity of Chagford. 
(Tract.) 8vo. Plymouth, 1866. 
—. Notes on the Carboniferous beds adjoining the northern edge of 
the Granite of Dartmoor. (Tract.) 8vo. Plymouth, 1867. 
—. Notice of Molars of Hippopotamus major stated to have been 
found in Kent’s Cavern, Torquay. (Tract.) 8vo. Plymouth, 1869. 
—. Notice of the occurrence of Scapolite at Chagford, Devon. (Tract.) 
Svo. Plymouth, 1869. 
—. Archeological Memoirs relating to the East of Dartmoor. 
“ 8vo. Exeter, 1876. 
Orsted (Hans Christian). Obituary Notice. See ForcuHAMMER (G.). 
Orth (Albert). Geognostische Durchforschung des schlesischen Schwemm- 
lards zwischen dem Zobtener und Trebnitzer Gebirge. 
8vo. Berlin, 1872. 
——. Ueber Untersuchung und kartographische Aufnahme des Bodens 
und Untergrundes grosser Stiidte. (Tract.) 8vo. Berlin, 1873. 
Bericht tiber die Bodenarten, Bodenkarten und bez. geologischen 
Karten auf der Weltausstellung zu Wien 1873. (Tract.) 
8vo. Berlin, 1873. 

