26 Field Museum of Natural History — Reports, Vol. V. 



there has been a constant addition of new material in the form of 

 single specimens or small groups. Room for these has for the most 

 part been obtained by withdrawing older specimens from exhibition. 

 Space for increase in the ntmiber of rare earths and timgsten ores 

 was obtained by withdrawing a portion of the antimony collection 

 from exhibition. A collection of rocks from German coal fields 

 which was properly a part of the coal collections not now on 

 exhibition was withdrawn and the space gained utilized for the dis- 

 play of three new collections more in harmony with adjacent ex- 

 hibits. One of these is a collection of fuller's earths from the most 

 important American locaHties; another is a series illustrating the raw 

 materials, intermediate and final products of Portland cement; and the 

 third collection is one giving a synopsis of the uses of quartz and quartz 

 sands. In this collection ntmierous specimens show the more common 

 occurrences of quartz; then the grades of quartz used for the more 

 valuable products, such as prisms, lenses and blown quartz utensils; 

 and a third section shows specimens of the poorer qualities of quartz 

 used for more ordinary purposes and sands suited to many special 

 uses. These collections were installed in Hall 35. By reinstallation 

 and some crowding of specimens a much enlarged collection of barite 

 has been accommodated in the space formerly devoted to fewer 

 specimens of this mineral. To the collection illustrating products 

 of coal tar, some of the better known medicinal substances made from 

 it such as phenacitin and acetanilide have been added. In Higin- 

 botham Hall all the specimens were removed from the four central 

 gem cases, the cases lined with new white silk and the specimens re- 

 installed. This work was necessitated by the fact that the old lin- 

 ings had become worn and faded. New linings were also provided for 

 the upper parts of these cases and shelves of finished glass supported by 

 glass pillars were put in place of the rough shelves swinging on chains 

 which had hitherto been used. A new series of moss agates and 

 jaspers was installed and some other minor changes were made. In 

 Alcove 105, leading to Higinbotham Hall, the collection numbering 

 163 specimens illustrating the varieties and occurrence of amber which 

 was obtained last year was installed. This collection illustrates different 

 forms and colors of crude amber, forms and colors of pressed amber or 

 ambroid, carvings in amber, fossils found in amber, distillation products 

 of amber, etc. The collection was installed on a series of glass shelves, 

 each specimen being secured to an individual mahogany stand. In front 

 of each specimen was placed a label secured by an individual cHp. To 

 the exhibition series of systematic minerals about fifty specimens of 

 recent accessions were added. The series of Salt Lake products was 



