Photographic Services 63 



Hall, the mammal groups and the Indian collections are espe- 

 cially popular. These special groups visiting the Darwin Hall 

 during the year numbered 579, comprising 17,622 pupils from 

 253 institutions. Exhibition hall instruction is also carried 

 on through the comprehensive labels of the exhibits which 

 Director Lucas is developing. The importance of this silent 

 instruction is often overlooked. For instance, during Regents' 

 Weeks thousands of high school pupils carry on laboratory 

 and field work in the halls, using the labels as a text-book. 

 The total attendance of visiting classes numbered 33,152. 



The photographic work stands as the indirect educational 

 activity of the Department. Through this illustrative mate- 

 rial, which is prepared for Natural History and 

 Photographic ther Museum publications, or which is supplied 

 to the Publicity Committee, writers, publishers 

 and lecturers, the Museum is extending its usefulness. The 

 amount of this work is considerable. During 1920, the photo- 

 graphic division produced 2,013 negatives, 16,385 prints, 796 

 enlargements and transparencies, and 4,494 lantern slides. The 

 reference file has been augmented by 7,626 negatives, including 

 3,874 presented by Mr. Julian A. Dimock and 2,000 received 

 from Dr. Frank M. Chapman. Our reference file now con- 

 tains 68,265 negatives and 79,360 catalogued prints. 



Early in the year Miss Ruth E. Crosby was promoted from 

 Assistant to Assistant Curator. In November, 

 pkange* Miss Helen M. Vreeland, who for nine years had 



rendered faithful service as Secretary of the De- 

 partment, resigned, taking with her in her new career the 

 best wishes of her co-workers. Miss Anne E. Bacon was ap- 

 pointed to this position on November 15, 1920. 



Although the regular extension work fully occupies the time 

 of the Department Staff, there have been several instances in 

 which the advice and counsel of staff members 

 Outside have been sought by outside organizations. The 



of C Staff e8 Curator was elected one of the Directors of the 



School Nature League with which the Museum 

 has been actively cooperating. The Curator and Associate 



