( 200 ) 
table pigments. The results of some researches upon the 
physiological influence of the heavy metals upon plants, ob- 
tained in codperation with Dr. R. H. True, were published in 
the Bulletin of the Torrey Botanical Club for July, 1903. 
Mrs. E. G. Britton, voluntary assistant, has continued her 
studies of the mosses of Cuba, Porto Rico, Haiti, and the 
continent of North America. The results of critical studies 
on various genera have been published in bryological journals. 
Accessions to the herbarium of mosses aggregating over four 
thousand specimens have been received, studied and dis- 
tributed. Investigations of the morphology and life-history 
of Vittarca begun in 1901 have been continued. A paper on 
this subject in codperation with Miss A. Taylor was pub- 
lished in the Memozrs of the Torrey Botanical Club, Vol. 8, 
No. 3, 1902. 
Mr. R. S. Williams, collector in the Philippines, made a 
critical study of the mosses from the Yukon collected by 
Prof. J. M. Macoun in 1902, some of the results of which 
were published, and also examined the mosses of the Harri- 
man Expedition to Alaska. Mr. Williams also studied a col- 
lection from Cape Nome, Alaska. The first installment of 
the enumeration of the mosses collected by Mr. Williams in 
Bolivia was published in BuLLETIN No. 9; here 143 species 
were critically described, three new genera and thirty species 
of which were new to science. He also prepared sets of these 
mosses for distribution to other institutions. 
Mr. Williams was appointed collector for the Garden in 
the Philippines, and started for the scene of his duties in 
September. 
Dr. H. H. Rusby, curator of the economic collections, has 
completed the preparation of the sections of Buck’s Refer- 
ence Handbook of the Medical Sciences relating to materia 
medica and therapeutics, comprising volumes VI to VIII in- 
clusive. He has also completed his part of the work on the 
botany and materia medica of the U. S. Pharmacopoeia, 
eighth decennial revision, now in press. Work on other pub- 
lications has been carried forward. He has also made pre- 
