One of the two new exhibits in the Hall of Economic Geology 

 (Hall 36) shows silver, lead, and zinc ores from the famed mines of 

 Laurium, Greece. The other is devoted to the mineral resources 

 of the State of Illinois, in which connection thanks are given for his 

 timely help to George M. Wilson, head of the Educational Extension 

 Division of the Illinois Geological Survey. 



Twenty new exhibits were installed in the new Hall of Meteo- 

 rites and Minerals (Hall 35), of which the completed mineralogical 

 section contains eleven exhibits of materials introductory to min- 

 eralogy, twenty of minerals arranged systematically, and eight of 

 uncommon minerals. Work on the meteorite exhibits, which occupy 

 the west end of Hall 35, was resumed upon the return of Chief 

 Curator Roy (see page 61), and one exhibit (classification and struc- 

 ture of meteorites) neared completion at the end of the year. Eight 

 cases housing large meteorites were rebuilt by the Division of Main- 

 tenance. The huge model of the moon at the west wall of Hall 35 

 was renovated and set in a sky-blue background, which, artfully 

 illuminated by the Division of Engineering, is strikingly effective 

 and lends to the entire hall a pleasing appearance. 



Harry E. Changnon, Curator of Exhibits, Assistant Horback, and 

 Preparator Henry U. Taylor successfully carried out this exhibi- 

 tion program. Associate Curators Forslev and Woodland were 

 largely responsible for the sequence of the exhibits, the descriptive 

 labels, and the selection of specimens. Drawings of crystal structure 

 and diagrams are the competent work of Miss Wiebe, Artist. 



Microphotograph of a thin section of 



a chondritic stony meteorite (see page 61) 



66 



