_Sil. Syst._ The Silurian System, by Sir R. I. Murchison. 2 vols. 4to. with plates and map. _Org. Rem._ Parkinson's Organic Remains of a Former World. 3 vols. 4to. _Oss. Foss._ Ossemens Fossiles, par Baron Cuvier. 5 vols. 4to. 5^{me.} edit. _Min. Conch._ Sowerby's Mineral Conchology. 6 vols. 8vo. _Odont._ Odontography; a Treatise on the Comparative Anatomy of the Teeth, by Professor Owen. 2 vols. 8vo. _Brit. Mam._ British Fossil Mammalia; by the same Author. 1 vol. 8vo. _Brit. Rep._ Reports on British Fossil Reptiles in the British Association Transactions for 1839, and 1841; by the same Author. _Phil. York._ Geology of Yorkshire, by Professor John Phillips. 2 vols. 4to. _South. D._ Fossils of the South Downs, 1 vol. 4to. 42 plates by the Author. 1822. _Geol. S. E._ Geology of the South-east of England. 1 vol. 8vo. by the same. _Tilg. For._ Fossils of Tilgate Forest. 1 vol. 4to. 20 plates; by the same. 1827. _Poiss. Foss._ Recherches sur les Poissons Fossiles, par M. Agassiz. 4 vols. 4to, and 2 vols, folio. _Man. Geol._ Manual or Elements of Geology, by Sir C. Lyell. 1 vol. 8vo. Edit. 1852. The following abbreviations are also employed:-- § 1. _Relative to the Rocks or Strata._ _Drift._ Alluvial deposits, or Drift. _Tert._ Tertiary. _Lond. C._ London clay. _Cret._ Cretaceous formation. _U. Ch._ Upper chalk. _L. Ch._ Lower chalk. _Trias._ New Red Sandstone, or Triassic deposits. _Carb._ Carboniferous or Coal formation. _Mt. L._ Mountain or Carboniferous limestone. _Devon._ Devonian or Old Red Sandstone formation. _Sil. Syst._ Silurian System, or formation. § 2. _Relative to Organic Remains._ _nat._ Natural size. × Magnified in diameter: _e.g._ × 8, magnified eight diameters, &c. × × Highly magnified; the degree not accurately determined. _inv._ Invisible to the naked eye. -- Less than natural: _e.g._ --2/3, reduced to two-thirds the diameter of the original. _Lign._ Lignograph or woodcut. _Explanation of Terms._--Upon the occurrence of a scientific word apparently requiring explanation, the _meaning_, where practicable, is for the most part given in a parenthesis; for example, Caulopteris (_fern-stem_); Phascotherium (_pouch-animal_); carboniferous (_coal-bearing_); except in the case of arbitrary names, and of those whose derivation cannot be concisely expressed.[8] With the view of rendering these volumes more generally useful, English terminology is in many instances made use of, though involving inelegance of expression. [8] Upwards of 300 scientific terms are explained in the Glossary, "Wonders," vol. ii. p. 915-921.