(150) 
The explorations of the year included further work in 
Porto Rico by several persons. Dr. and Mrs. Britton, 
with the late Mr. J. F. Cowell and Mr. Stewardson Brown, 
spent two months, in February and March, in exploration 
on that island. The work of Professor N. Wille, of the 
University of Christiania, in the collection of fresh-water 
algae, announced in our last report as having been com- 
menced, was completed during the early part of the present 
year, and yielded very rich scientific results. This work 
was supplemented by several weeks’ work in June and 
July in the collection of marine algae by Dr. Marshall A. 
Howe, in the waters surrounding the island. 
Several weeks were devoted by Dr. Small to work among 
the Florida Keys, an exploration that was made possible 
through the generosity of Mr. Charles Deering. The 
object of this exploration was peculiar, if not unique. 
Upon these small islands grow many species of plants which 
are either very scarce, or do not grow at all in any other 
locality. As a result of clearing of the land, which is 
rapidly progressing, such species are doomed to early 
extinction. Mr. Deering has for some time been engaged 
in preserving these plants by introducing them to his 
estate near Miami, and it was to the mutual advantage 
of both Mr. Deering and the Garden that Dr. Small was 
able to cooperate in this work. 
The usual activity in the acquisition and care of her- 
barium material has been maintained, more than 36,000 
specimens and a corresponding number of herbarium sheets 
having been added, not including a very large addition to 
our mycological herbarium. The interest in our work 
in the study of fungi has again shown a decided increase, 
there having been an unprecedented call for information 
on the subject and for the identification of specimens. A 
large number of new species and genera, representing all 
classes of plants, have been described during the year. 
Our laboratory work has continued to show expansion 
in activity and interest. The work of Dr. Stout in the 
