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laboratories, has published an elementary text-book of plant 

 physiology suitable for use in schools and colleges, and has 

 completed his work upon the relation of light and darkness 

 to growth and development. The results of this extended in- 

 vestigation are being published in Volume TI of the Memoirs 

 of the Garden, and the final pages are now coming from the 

 press. Dr. MacDougal made an examination of the desert 

 flora of Arizona, Sonora and Texas in February, and secured 

 many characteristic specimens for the conservatories, which 

 furnish valuable material for many investigations now in 

 progress. 



Dr. John K. Small, curator of the museums, has continued 

 his attention to the flora of southeastern United States, and 

 has made critical studies of a number of families, resulting in 

 some important rearrangements. He has made considerable 

 progress in the work upon several genera for the Systematic 

 Botany of North America, the publication of which has been 

 undertaken by the Garden. The preparation of his manual 

 of the flora of the southern United States has been carried 

 forward and is approaching completion. 



Dr. P. A. Rydberg, assistant curator, has continued his 

 study of the flora of the Rocky Mountain region and made a 

 critical examination of the Nyctaginiaceae of North America. 

 Dr. Arthur Hollick, assistant curator, has brought his work 

 upon the Pleistocene flora of the Chesapeake Bay region to a 

 close, and has made critical examinations of a large amount 

 of Cretaceous material from Western America. 



Mr. F. S. Earle, assistant curator, made some explorations 

 in western Texas and New Mexico during the earlier portion 

 of the year, and secured much valuable material for the col- 

 lections. He has determined a great number of specimens of 

 fungi from various regions and paid special attention to the 

 fleshy fungi of the local flora. Professor Earle has continued 

 his critical study of the Agaricaceae and has completed de- 

 scriptions of the North American species of this group. At 

 the request of the Government of Jamaica he made a tour of 

 investigation of that island and prepared a preliminary report 



