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continued his studies on the ferns and fern-allies of North 

 America, and also investigated certain families of fungi, 

 making use of the abundant material in the Ellis Herbarium. 



Dr. H. H. Rushy, Curator of the Economic Collections, 

 has continued his investigations of problems relating to Econ- 

 omic Botany and his studies upon the flora of Boliva. 



Dr. D. T. MacDougal, First Assistant, has published sev- 

 eral papers upon the nutrition of plants, dealing chiefly with 

 mycorrhizas, and has continued his work upon the relations 

 of plants to light, and upon the climatic relations of plants. 



Dr. J. K. Small, Curator of the Museums, has continued 

 his work on the flora of the Southeastern United States. His 

 manual of this flora is now in press. 



Dr. P. A. Rydberg, Assistant Curator of the Museums, has 

 published a series of studies upon the flora of the Rocky 

 Mountains upon which he is yet engaged. 



Mrs. E. G. Britton, voluntary assistant, has continued her 

 investigations of American mosses. 



Mr. R. S. Williams, Museum Aid, has classified the large 

 collections of mosses made by him in the Yukon Territory 

 and in Montana. 



Mr. Percy Wilson, Museum Aid, has pursued studies upon 

 trees of the walnut family and upon the local flora. 



Prof. F. E. Lloyd, of Columbia University, has studied 

 the embryology of the Rubiaceae and allied groups made an 

 arrangement of the Lycopodiums of North America, and 

 brought out other papers of general interest. 



Dr. M. A. Howe, of Columbia University, has been oc- 

 cupied with researches upon the Hepaticae, having brought 

 out in Memoirs of the Torrey Botanical Club a fine volume 

 on the Californian plants of that group ; more recently he 

 has devoted himself to the critical study of Algae. 



Mr. Geo. V. Nash has pursued studies upon numerous 

 horticultural problems, and also upon the taxonomy of North 

 American grasses. He contributes the descriptions of grasses 

 to Dr. Small's Manual of the Flora of the Southern States, 

 and to my Manual of the Flora of the Northern States and 

 Canada, both of which are in press. 



