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printed book lists of dealers, on account of the competition for 
such works by other institutions. Several thousand volumes 
of the older literature still remain to be secured, however, and 
the process of securing them will naturally become slower as 
it proceeds, owing to the rarer volumes being less frequently 
obtainable, but by the continuance of the arrangement and 
by keeping up the recent publications, the collection may 
ultimately be made as complete as any in existence, the con- 
dition which is sought to be obtained. 
Contributions of money, credited tothe Special Book Fund 
and used for this purpose during the year, are as follows: 
F. N. Warburg $100.00 
Samuel Thorne ...0........0ccccc cee cence ee eae eee enone 100.00 
Louis Haupt..................6008 10.00 
Addison Brown 100.00 
Ola lic ccee esc aete tie ein cate ete ees ok ates $310.00 
The growth of the library was provided for during the year 
by the construction of additional steel book-cases and the 
purchase of additional steel shelves, and the present equip- 
ment will probably be sufficient for the growth of the collec- 
tion during 1907. 
The number of institutions now on our exchange list for 
Garden BULLETIN or Garden ContTrisuTions, or both, is 
now 570, as against 500 at the time of my last annual report, 
and the value of their publications received by us is corre- 
spondingly increased. An estimate of the monetary value of 
the publications which we annually receive in exchange has 
been carefully made, and is not less than $800. 
Laboratories 
The report of the Director of the Laboratories, hereto ap- 
pended, gives details of the work directed by him and accom- 
plished by students and by visiting botanists, both in the 
laboratories and in other departments of the Garden. No 
important changes have been made in the equipment or 
arrangement of the laboratories, and expenditures of this 
account have been required only for supplies, reagents, and 
some additional apparatus. 
