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script for the ‘* North American Flora.” They have also 
aided largely in the naming of the conservatory and out-door 
plant collections. Students have used such groups of this 
collection as their investigations demanded. 
Investigators, chiefly students and officers of other institu- 
tions, have had access to the herbarium, and other persons 
duly qualified have also been able to examine specimens by 
your permission. 
Assistance and Investigations 
Dr. Shafer, Museum Custodian, has supervised the prepara- 
tion of herbarium and museum material and the installation 
of the latter. He has made special and successful efforts to 
develop the exhibition of North American dendrology and 
the collection of drugs, as well as to strengthen the exhibits 
of the synoptic collection of the systematic museum. He 
has also continued his studies on the arborescent flora of North 
America. 
Dr. Rydberg, Assistant Curator, has been in charge of the 
part of the herbarium composed of flowering plants. In 
addition to routine curatorial work, including the sorting, dis- 
tributing and arranging of the herbarium specimens, he has 
also continued his work on the flora of the Rocky Mountain 
region, and portions of the results of his studies have been 
published during the year under the title, ** Studies on the 
Rocky Mountain Flora, XIV and XV,” in the Bulletin of the 
Torrey Botanical Club, for March and November, and ‘* The 
genus Astragalus and segregates, represented in Colorado” 
in the same journal, for December. Monographs of Pen- 
thoraceae, Parnassiaceae, Saxifragaceae and Hydrangeaceae, 
the two latter families prepared in conjuction with the writer, 
have been published in the ‘‘ North American Flora,” Vol. 
22, parts 1 and 2; his ‘* Flora of Colorado,” containing a 
catalogue and keys, which was mentioned in last year’s report, 
is now in press. 
During June, July and August he was occupied with botani- 
cal exploration in Utah, except for a short time spent in Cali- 
