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REPORT OF THE BIBLIOGRAPHER 
Dr. N. L. Brirron, Direcror-1n-CuHier. 
Sir: I have the honor to submit the following report for 
the year 1920. 
As usual, much time has been taken for personal assist- 
ance to those consulting the library, both visitors and 
members of the Garden Staff, but a limited amount has 
been available for bibliographic research. 
The progress of North American Flora has shown some 
little improvement over the preceding year, but condi- 
tions of publication are still far from what might be de- 
sired. Volume 24, part 2, appeared in January; but it 
was not until near the close of the year that parts 4 and 5 
of Volume 7 were published. ‘These, as well as part 6 of 
the same volume, had been in press for many months, but 
various obstacles prevented their completion. There is 
much manuscript on hand for future numbers of North 
American Flora. 
Of Addisonia three numbers were issued during the 
year. The firm that prepared the colored plates for these 
numbers did more satisfactory work than any we have had 
before, but increasing costs made it necessary to change our 
color-printers again, and this has caused delay in the final 
number of the fifth volume. Increased cost of production 
compelled the reduction this year from ten to eight plates 
per number. 
The most noteworthy additions to the Library during 
the year were the books purchased by the Director-in- 
Chief in England during his visit last summer; most of 
these did not arrive in New York until the closing days of 
the year. A number of them were sumptuous and rare 
volumes—particularly may be mentioned the seven large 
folios, with colored plates, of Humboldt, Bonpland, and 
Kunth’s Genera plantarum, which were presented to the 
Library by the Director-in-Chief. 
The papers by the Bibliographer published during the 
year were more numerous than usual, but mostly brief and 
