218 Field Museum of Natural History — Reports, Vol. IV. 



cannot be displayed at the present time, it is believed that the altera- 

 tions in the method of installation are such that the educational value 

 of the collection is greater than it was before. The collections of gold, 

 silver and lead ores in Hall 34 which had been only temporarily rein- 

 stalled after their removal from the west annex were given careful 

 revision. Although no great changes were made, slight alterations in 

 the positions of over a thousand specimens were instituted so as to 

 improve the general appearance of the installation and aid especially 

 by displaying in as good a light as possible the important features of 

 the individual specimens. The placing of new labels was carried out at 

 the same time. A number of specimens from the quartz-gold and 

 copper mines of Alaska and a few other individual specimens were added 

 to the exhibition series in this Hall. The collections of alkalies, abrasives 

 and allied material in Hall 3 1 were cleaned and more or less rearranged 

 in such a way as to secure the best illumination. This involved in a 

 few instances the interchange of sections of the collection, but prin- 

 cipally was accomplished by a rather tedious placing of the individual 

 specimens in many positions and at many angles until the best position 

 had been found for each specimen. Considerable rearrangement of 

 the abrasives collection was also required to make room for a recently 

 acquired collection of artificial corundum. An Australian coal column 

 was installed in Hall ^t, and encased in glass to insure its protection. 

 In Hall 59 the contents of two cases were rearranged and condensed 

 in order to devote one to the exhibition exclusively of the fine series 

 of fossil mammals collected in 19 10 from the Uintah basin. The 

 collection as now exhibited is much the most complete and repre- 

 sentative of the mammals of the lower Uintah formation ever shown. 

 It includes twenty -four skulls and much other skeletal material. The 

 types of one new genus and four new species recently described by 

 the Assistant Curator of Paleontology form a part of the series. 

 Two models of early forms of iron-smelting furnaces were built 

 in the Department work rooms and placed on exhibition. These 

 models are part of a series showing the development of the blast 

 furnace and supplement the modern blast furnace already on ex- 

 hibition. One of the models represents the stone-stack cold-blast 

 furnace as it was developed during the first half of the 19th century. 

 It consists of a pyramidal stone furnace 8 inches square at the base 

 and 1 2 inches high. The working arch at the base which faces the front 

 of the model shows the tymp and dam in use at that time. The two 

 tuyere arches at the side show the fire-clay tuyeres entering the furnace. 

 At the top of the furnace are shown the charging doors. To the right 

 of the furnaces limestone cliff rises to the level of the furnace top, and 



