630 GENERAL SCIENCE. 



Lea, Isaac, (cont.). Fossil Foot-marks in the Red Sandstone of 

 Pottsville, Pennsylvania. Folio. Philadelphia, 1855. 

 [List of] Publications of Isaac Lea on recent Conchology. 



8°. Philadelphia, 1861. 

 A Synopsis of the Family Unionidse. Fonrth edition. 



4°. Philadelphia, 1870. 



— — [Remarks on a communication of Prof. Agassiz (Classification 

 of Fresh- water Molluscs) ; on the great size of certain Naiades from 

 the neighbourhood of Cincinnati.] 8°. [Philadelphia]- 



Check List of the Shells of North America. UnionidsB. 8°. 



• and Lea, Henry 0. Description of a new Genus of the Family 



Melaniana, and of many new species of the genus Melania . . .. 

 also descriptions of five new species of Anodontas, by I. Lea. 



8°. London, 1851. 



Lea, Thomas G. Catalogue of Plants, native and naturalized, collected 

 in the vicinity of Cincinnati, Ohio, during the years 1834-1844. 



8°. Philadelphia, 1849.. 



Lea, W. A treatise on the Resolution of the higher Equations in Alge- 

 bra. 4°. London, 1811. 



Leach., William Elford. Zoological Miscellany ; being descriptions of 

 new or interesting animals ; with coloured figures by R. P. Nodder.. 



3 vols. 8°. London, 1814-17. 



Leadbetter, Charles. Astronomy of the Satellites of the Earth, Jupiter 

 and Saturn ; . . . also new tables of the motions of the Satellites 

 of Jupiter and Saturn ; ... to which is added a problem to find 

 the Latitude of the place by the altitude of the Sun, Moon, or Star, 

 upon any azimuth. ... 8°. London, 1729. 



The Young Mathematician's Companion, being a compleat 



Tutor to the Mathematicks. Second edition. 12°. London, 1748. 



Leake, William Marlin. Travels in the Morea. 



3 vols. 8°. London, 1830. 



Life. See Marsden. 



Leaute, H, Etude Geometrique du probleme de l'lntegration des 

 Equations differ entielles partielles du premier ordre et a trois 

 variables. Du Frottement de Pivotement. (Paris, Theses Fac. 

 Sci., No. 369.) 4°. Toulouse, 1876. 



[Le Balleur.] Nouvelles Tables de Navigation, avec la maniere de 

 resoudre . . . tous les problemes d'Astronomie ou de Geographie 

 pratiques ; et une exposition . . . du probleme des Longitudes. 

 Troisieme partie. 8°. La Rochelle, 1789. 



Le Bas, Jean, Question importante : Peut-on determiner un terme 

 prefix pour l'Accouchement ? 8°. Paris, 1764. 



Nouvelles observations sur les Naissances tardives. 



8°. Paris, 1765. 



Le Besgue, V. A. Introduction a la Theorie des Nombres. 



8°. Paris, 1862. 



