Report of the President. 2 7 



F. M. Chapman. " The Birds of the Vicinity of New York City." (Leaf- 

 let No. 22, April and July, pages 1-96, with 44 text figures.) 



B. E. Dahlgren. " The Development of a Mollusk." (Leaflet No. 21, 

 January, pages 1-29, with 30 text figures.) 



R. W. Miner. "A Guide to the Sponge Alcove." (Leaflet No. 23, 

 October, pages 1-36, with 32 text figures.) 



Department of Physiology. — As usual, this department 

 has taken charge of all animals "in the flesh" which have 

 been received at the Museum during the year. These number 

 267 specimens. The "digestion method" of preparing osteo- 

 logical material, which was used with such good success in 

 1905, was continued, with the result that 103 complete skele- 

 tons, 34 skulls and 3 shoulder-girdles have been cleaned and 

 turned over to the various departments. 



Progress has been made in the preparation of anatomical 

 parts and in the construction of models and mechanical de- 

 vices which will assist in demonstrating the function of certain 

 organs of the body. Dr. Muenchehofe has prepared success- 

 fully a working model of the heart to show the action of the 

 aortic and auriculoventricular valves. 



During the summer Dr. Muenchehofe spent several weeks 

 visiting the museums of London, Berlin, Dresden, Leipsic, 

 Prague, Innsbruck and Naples, from which many ideas have 

 been obtained. We gratefully acknowledge the many courte- 

 sies extended to the Museum by the Director of the New 

 York Zoological Society, the Director of the New York 

 Aquarium, and the Director of the Central Park Menagerie. 



Department of Maps and Charts. — The maps of the 

 Western Hemisphere have been classified, and 2,344 have been 

 arranged on the filing frames. 



The summary of the acquisitions for the year is as follows: 



By Donation Atlases 46 Maps 169 



" Exchange " 99 " 31 



" Purchase " o " 679 



145 879 



Attendance. — The total number of visitors for the year 

 was 476,133. While this does not quite equal the record fig- 



