THE LITER A TURE OF FERNS. 39 



8vo, printed on one side only, and intended for 

 labelling specimens, as well as a list for purposes 

 of exchange. The latter was prepared under the 

 advice of Professor Eaton. 



The following works are interesting as contain- 

 ing references to American species : 



ICONES FILICUM : by Sir W. J. Hooker. Lon- 

 don, 1831. Folio. Contains descriptions and 

 plates of 12 species of ferns, one Ophioglossum, 

 and one Lycopodium of North America. This 

 work costs from $25 to $75, according to the 

 colored or uncolored condition of the plates. 



FILICES EXOTICA : by Sir W. J. Hooker. Lon- 

 don, 1859. Large 4to. Descriptions and plates 

 of 7 North-American ferns, and one Lycopodium. 

 Costs about $20. 



GARDEN FERNS : by Sir W. J. Hooker. Lon- 

 don, 1862. 8vo. Contains 4 North-American 

 ferns. Costs about $8. 



CENTURY OF FERNS : by Sir W. J. Hooker. 

 London, 1854. Large 8vo. Contains 3 species of 

 North-American ferns. Costs about $10. 



SECOND CENTURY OF FERNS : by Sir W. J. 

 Hooker. London, 1 86 1. Large 8 vo. Contains 2 

 North- American ferns. Costs about $10. 



SPECIES FILICUM : by Sir W. J. Hooker. Lon- 

 don, 1846-64. 5 vols. 8vo. Vol. ii. contains 17 

 and vol. iii. contains 2 plates of American ferns, 

 and descriptions of a greater number than this 

 of species. Costs from $40 to $60. 



