minerals not represented in the Museum's collections was made to 

 provide a quick checklist for obtaining specimens as they become 

 available. Likewise, the lithology collection was completely re- 

 arranged and a complete card index of the specimens was assem- 

 bled systematically according to type of rock. Much of this work, 

 particularly the task of storage and rearrangement of the mineral, 

 economic geology, and lithology collections was done with the aid 

 of Miss Judith L. Lipkowitz, Miss Gretchen S. Quigg, and Miss 

 Miss Judith V. Young, Antioch College students. 



The entire meteorite collection was rechecked as to classifica- 

 tion, alphabetical order, weight, and number of individuals repre- 

 senting each fall. Also all oxidized iron specimens were re-etched 

 and treated with a rust-resisting reagent. 



Exhibits— Geology 



The first of a series of new exhibits of fossil fishes was installed in 

 Ernest R. Graham Hall (Hall 38). The new exhibit deals with an 

 extinct Devonian group of armored fishes (placoderms) and fea- 

 tures a mount of one of its largest members, Dunkleosteus. In the 

 same hall two fossil mammal-skeletons (the remounted Irish giant 

 deer and the restored great ground sloth) were reinstalled. Both 

 skeletons are protected by new bases with glass panels. The fine 

 work of remounting, restoration, and reinstallation was done by 

 Chief Preparator Gilpin and Preparator Lambert. 



In the new Hall of Meteorites and Minerals (Hall 35) twelve 

 new exhibits devoted to meteorites were completed during the year. 

 An attempt has been made to present the subject-matter simply, 

 with special emphasis on the origin, phenomena of fall, form, classi- 

 fication, structure, composition, and distribution of meteorites. 

 Tektites and the relationship of meteorites to terrestrial rocks are 

 also shown. An outstanding exhibit in the hall is an oil painting 

 of the Arizona meteor crater, which is shown with specimens that 

 were collected in and around the crater. The painting and other 

 illustrative materials in the hall are the competent work of Miss 

 Maidi Wiebe, Departmental Artist, as is the illustrative and recon- 

 structive work in the fossil-fish exhibit in Hall 38. Five exhibits 

 in the Hall of Physical Geology (Hall 34) were dismanteled, reno- 

 vated, and reinstalled, work made necessary by the discoloration 

 of the backgrounds. The exhibition program was ably carried on 

 by Harry E. Changnon, Curator of Exhibits, Henry Horback, 

 Assistant, and Henry U. Taylor, Preparator. 



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