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Third Annual Report of the Regents of the University on the 

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Fourth Annual Report of the Regents of the University on the 

 Cabinet of Natural History. Albany, 1851. 8vo. Pamph. 

 Fro7n T. R. Beck. 



T. Smyth on the Unity of Human Races. 12mo. New York, 

 1850. From T. R. Beck. 



Fragments of the Natural History of Pennsylvania. By B. S. 

 Barton. 4to. Pamph. Part 1. Philadelphia, 1799. From T. 

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Transactions of the Entomological Society of London. Vol. I. 

 Part. 6. New Series. 8vo. Pamph. 1851. From the Ento- 

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Memoires de la Societe de Physique et d'Histoire Naturelle 

 de Geneve. Tome XII. 2de Partie. 4to. London, 1851. 

 Fro?n the Societe de Geneve. 



Proceedings of the American Academy. Vol. I. and pp. 

 1 - 232 of Vol. II. Svo. Boston, 1848 - 50. From the Ameri- 

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Geological Surveys of Canada. 8vo. Montreal, 1845-50. 

 From B. Homer Dixon. 



History of British Mollusca and their Shells. By Prof. E. 

 Forbes and S. Hanley. Part 40. Pamph. London, 1851. 

 Exchange with H. Cuming. 



Report of the Commissioner of Patents for 1850. (Congres- 

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 of Patents. 



Silliman's American Journal of Science and Arts. No. 36. 

 New Haven, November, 1851. Frojn the Editors. 



Proceedings of the Academy of Natural Sciences. Vol. V. 

 No. 10. pp. 235-259. Philadelphia, 1851. From the Aca- 

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Sitzungsberichte der Kaiserlichen Akademie der Wissenschaf- 

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Denkschriften der Kaiserlichen Akademie der Wissenschaften. 

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