(33) 
regions where the Garden’s work is most active and in the 
plant-groups in which the members of the scientific staff 
are engaged in studying and monographing. 
Only such specimens as were needed for the current and 
future work of the Garden were mounted and incorporated 
in the permanent collections. Consequently about 32,000 
herbarium sheets containing approximately 60,000 speci- 
mens were added to the various divisions of the herbarium. 
Several hundred desirable specimens from the Morong 
Herbarium were mounted and incorporated in the Columbia 
University herbarium. 
Investigations and Assistance 
Dr. P. A. Rydberg, Curator, continued the general care 
of the collections of flowering plants and continued his 
monographic work on the Rosaceae for the Norra AmER- 
IcAN Fitora. He also carried onward his studies on the 
flora of the Rocky Mountain Region, publishing a paper in 
this connection in the Bulletin of the Torrey Botanical Ciub, 
and prepared a report on the plants secured on two of 
Peary’s North Polar Expeditions. During the summer, 
Dr. Rydberg prosecuted botanical exploration in south- 
eastern Utah covering territory which had not bef:re been 
explored. A detailed report of this expedition was pub- 
lished in the November number of the JourNAL, and the 
plants collected have been mounted and are now being 
studied. On his return from the field, Dr. Rydberg visited 
the herbarium of the Missouri Botanical Garden in order 
to study their collections of Rosaceae in connection with 
the monographic work referred to above. 
Dr. Marshall A. Howe, Curator, continued in charge of 
the collections of algae and hepaticae. The herbarium 
work under his direction has resulted during the year in 
adding to the collections about 4,600 mounted sheets of 
hepaticae and 400 sheets of algae. An important feature 
of this work has been the substantial beginning of the task 
of incorporating the Mitten and the Underwood collections 
