71 
States, 1878-80; H. G. Miner’s Orchids, 1885; William Hille- 
brand’s Flora of the Hawaiian Islands, 1888; Hermann Miiller’s 
Fertilization of Flowers, tr. by D’Arcy W. Thompson, 1883; W. 
H. Harvey’s A Manual of the British Marine Algae, 1849; E. F. 
Smith’s Bacteria in Relation to Plant Diseases, v. 2, 3, 1911-1914; 
Ernst Kister’s Pathological Plant Anatomy, tr. by F. Dorrance, 
1914. Some twenty or more volumes have been added to our 
material on evolution and plant breeding, including Arnold Lang’s 
Die experimentelle Vererbungslehre in der Zoologie seit 1900, 
erste Halfte, ror4, 
Our library now numbers 3,804 volumes and 5,885 pamphlets. 
This count does not include current numbers of periodicals, which 
are bound when the volumes are complete, to be entered as fresh 
accessions on their return from the binder. Reference to the 
statistical tables at the end of this report shows that the total 
increase in volumes and pamphlets received since December 31, 
1914, amounts to 3,006 publications. 
On comparing the highest number in the accession catalog 
December 31, 1915,—namely 2,960—with the number of volumes 
shown by our statistical table to be actually in the library,—namely 
3,804,—it should be explained that the books transferred by the 
Central Museum in November, 1913, to the Brooklyn Botanic 
Garden, and numbering between eight and nine hundred volumes, 
are not entered on our accession book as the property of the 
library. 
Periodicals 
‘Special stress has been laid on making our files of current 
periodical literature as rich as possible. Partly through fresh 
subscriptions and by gift, but much more by means of setting up 
new exchanges with the Garden publications, our serial list has 
been increased this year by more than one hundred titles. Among 
the more important additions in the line of current periodicals 
may be mentioned the Proceedings of the National Academy of 
Sciences, Baltimore; the Bulletins of the International Institute 
of Agriculture at Rome, Italy, and the Bulletins of the Canadian 
branch at Ottawa ; the Journal of the Royal Horticultural Society, 
London; Annals of the Bolus Herbarium, South African College, 
Cape Town; Nyt Magazine for N aturvidenskaberne, Christiania ; 
