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Memoires presentees a I'Academie Imperiale des Sciences de 

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Memoires de PAcademie Imp. des Sc. de St. Petersbourg, VI'''^ 

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Schriften der in St. Petersburg, gestifelen Russ. Kais. Gesell. 

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 Administration of Mines of Russia. 



Annates de PObservatoire Physique Central de Russie, 1850. 

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Compte-Rendu Annuel, 1852. (Supplement to the Annals.) 

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Novarum et minus cognitarum Stirpium pugillus nonus, addita 

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 Lyceum of Natural History of New York. 



Annals. Vol. V., Vol. VI. Nos. 1 - 4. 1854. 8vo. New 

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On the Osteology of the Head of Hippopotamus, and a Descrip- 

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Smithsonian Contributions to Knowledge. Vols. III. and IV. 4to. 

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Smithsonian Report on Recent Improvements in the Chemical 

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