13- New Species of Potentilla and its Allied Genera, 

 with drawings prepared for a monograph of Potentilla 

 and its allies. Exhibited by P. A. Rydberg. 



14. Herbarium Specimens illustrating the Variability of 



SPECIES OF PoLYPODiUM IN CALIFORNIA. Exhibited by 

 Marshall A. Howe, Columbia University. 



15. Specimens of the Rare Hart's Tongue Fern {Scolo- 



pendriu?}i) from Chittenango Falls, Madison county. 

 New York. Exhibited by Willard N. Clute. 



16. Some of the Rare Ferns of Alabama, with herbarium 



specimens. Exhibited by L. M. Underwood. 



17. Mosses from the Vicinity of Lake Placid and Adiron- 



dack Lodge, illustrating the flora of the highest peaks 

 of the Adirondack Mountains, N. Y., including Marcy, 

 Mclntyre and Whiteface. Exhibited by Elizabeth G. 

 Britton. 



18. Microscopic Preparations Illustrating the Hepatic 



Flora of California. Exhibited by Marshall A. 

 Howe, Columbia University. 



19. Manuscript of "A Revision of the North American 



IsoTHECiACEAE AND Brachytheciaceae," with speci- 

 mens of new and interesting species. Exhibited by A. 

 J. Grout. 



20. Characeae Americanae. Part H, fascicle 3, with 



specimens of the new species therein described. 



21. New species of Characeae, with illustrations of speci- 



mens. 



Nos. 20 and 21 exhibited by Dr. Timothy Field Allen. 



22. A Study of the Moulds of the Bacterial Laboratory 



of the College of Physicians and Surgeons. Ex 

 hibited by Smith Ely Jelliffe, M.D. 



23. Some of the Bacteria of the Croton Water Supply. 



Exhibited by F. G. Knerr, M.D., and Smith Ely Jel- 

 liffe, M.D. 



