MISSOURI BOTANICAL GARDEN BULLETIN 15 
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Use of Herbarium by Outside Botanists.—Visiting bota- 
nists from different parts of the country have consulted the 
herbarium from time to time during the year. Several loans 
of herbarium specimens have been made to institutions in 
order to facilitate the work of specialists in monogra hing 
technical groups of plants, and in studying the detailed flora 
of different parts of the country. Such loans for the most 
part have been of mutual advantage. An important work 
has been undertaken by Dr. Norma E. Pfeiffer of the Uni- 
versity of North Dakota, who spent the month of July in the 
herbarium in pursuance of a monographic study of Isoetes. 
Statistical Summary: (For the year ending December 31, 
191Q). 7. 
Number of specimens acquired on new accessions : 
By purchase .......--+--+++eeereees 19,070 
BS Sie Aen en ede 5,556 
By exchange ....-----+++eeeses rere 3,489 
By field work......---++++-+++-e++0% 8,537 
TOU) oo ee ns 36,652 valued at $3,665 20 
Number of specimens mounted and incorporated : 
From Chapman Herbarium........--- 1,485 
From all other sources.....-----.++-> 15,860 
Total ineseeri wees 17,345 valued at $3,469 00 
Number of specimens discarded from the 
herbarium ...-.--+se+eeeereere cress 136 
Number of specimens sent to correspondents 
on the basis of exchange......---+-++> 2,582 
Number of specimens in organized her- 
teFitink 2 ois 6 Sos Span © OS ES 820,772 valued at $123,983 05 
Number of specimens in unorganized her- 
barium (estimated at)....---..++--+> 62,000 valued at 5,080 00 
Wood specimens, ete., supplementing the 
Cees pre ea ee ie hea Cee tee valued at 280 00 
Microscope slides, ete.....--++++r-++errerr rte valued at 410 00 
Total valuation ........---++es+erees $129,753 05 
LIBRARY 
Since the Garden library receives annually 944 serial 
ublications containing more or less botanical matter, a 
arge part of the daily work is required for checking up 
and entering the current numbers of these publications as 
they arrive, sending them on the round of the laboratories, 
collating the volumes for the binder and finally indexing 
and distributing them on the shelves. 
