XXXIX 



Descriptions of New Genera and Species of North American Krogs. 



Hy Spencer F. Baird. 1854. (Beprinted from the Proceedings 



Philad. Acad. Nat. So 

 Report of the Commissioner of Patents for 18 >0. Part I. Arts 



and Manufactures. 1851. Part II. Agriculture. Washington. 



1851. 8. 



Report of the Commissioner of Patents for 1851. Part II. Agri- 

 culture. Washington. 1852. 8. (2 Exp.) 



Report of the Commissioner of Patents, for the Year 1851. Part I. 

 Arts and Manufactures. For the Year 1852. Part II. Agri- 

 culture. Washington. 1852. 53. 8. 



Address to the Boston Society of Natural History. By John C. 

 Warren. Boston. 1853. 8. 



Transactions of the Wisconsin State Agricultural Society. 2 Vols. 

 Madison. 1852. 53. 8. 



Report of the Board of the Trustees of the Wisconsin Institution 

 for the Education of the Blind, Dec. 31. Madison. 1853. 8. 



Transactions of the Michigan State Agricultural Society. 4 Vols. 

 Lansing. 1849—52. 8. 



Report of an Expedition down the Zuni and Colorado Rivers. By 

 Capt. L. Sitgreaves. Washington. 1S53. 8. 



The Philosophy of Physics etc. By Andrew Brown. Redfield 

 (New-York). 1>54. 8. 



Journal of the Academy of Natural Sciences of Philadelphia. New 

 Series. Vol. II. Part I— IV. Philadelphia. 1850-54. 4. 



Proceedings of the Academy of Natural Sciences of Philadelphia. 

 Vol. V. 1850. 51. Vol. VI. 1852. 53. Vol. VII. Nr. I, 2. 

 1854. pp. 1—67. 8 



Notice of the Origin, Progress and Present Condition of the Aca- 

 demy of Nat. Sciences of Philadelphia (Read befoie the So- 

 ciety, Feb. 10, 1852.) By W. S. W. Ruschenberger, Surgeon 

 U. S. Navy. Philadelphia. 1832. 8. 



Bibliographia Americana Historico-Naturalis etc. for the year 1851. 

 By Ch. Girard. Washingion. 1>52. 8. 



Annais of the Lyceum of Natural History of New-York. Vol. VI. 

 Nr. 1. 1853. Nos. 2—4. New-York. 1854. 8. 



Researches upon Nemerteans and Planarians. By Ch. Girard. I. 

 Emhryonic Development of Planocera Elliptica. Philadelphia 

 1834. 4. 



Proceedings of the American Association for the Advancement of 

 Science. I. Meeting. Sept. 1848. Philadelphia. 1849; HI. Meet. 



Institutum 

 Smithsonianum 

 Washingtonense. 



