Oct. 1900. Annual Report of the Director. 449 



added and the whole fully labeled. The interiors of several cases in 

 this hall have been repainted. The collection of rocks of the Saar- 

 brucken coal fields has been transferred to Hall 70 (coals and hydro- 

 carbons). The use of a base for the installation of this collection 

 which slopes from the center to two sides of the case has proved 

 most satisfactory in the way of securing good lighting of the speci- 

 mens. It is intended to substitute frequently such bases for the 

 pyramids hitherto employed. In the place left vacant in Hall 66 by 

 removal of the above-mentioned collection, the collection of rocks 

 accompanying the iron ores of Lake Superior has been installed. 

 The large .map in Hall 62, showing localities of meteorite falls in the 

 United States, has been brought up to date. New relief maps 

 obtained by gift or purchase have been placed in position in Hall 60, 

 space for their exhibition being secured by the removal of several 

 wall maps which had less value. The collection of dinosaur bones 

 made by the Wyoming Expedition of last year was cleared from the 

 matrix and made ready for exhibition during the winter months. To 

 provide for exhibition of the specimens, additional floor cases were 

 placed in both Halls 36 and 59, as well as a base for mounting a hind 

 leg. The specimens of Dinosaur remains now on exhibition in 

 these halls include a hind leg and portion of the pelvic girdle of 

 Morosaurus ; a series of sixteen caudal vertebrae, reaching a total 

 length of fifteen feet, of Diplodocus ; a scapula and coracoid over five 

 feet in length of Morosaurus ; a femur of Diplodocus of about the same 

 length and many miscellaneous vertebras and pelvic and leg bones of 

 Diplodocus, Brontosaurus and Creosaurus. A large slab of reptile 

 tracks from Turner's Falls, Massachusetts, has been framed to insure 

 its preservation, and placed in position in Hall 36. The exteriors of 

 the floor cases in Hall 35 have been repainted. The laboratory of 

 vertebrae paleontology has been enlarged by adding to it space 

 formerly occupied by the departmental library, the book-cases from 

 the latter having been transferred to the office. The equipment of 

 this laboratory has been further increased by the addition of a turn- 

 ing lathe, bench, and sink with running water. To the departmental 

 store-room a stack of storage trays and a mineral trimmer have been 

 added, the latter proving especially serviceable. The temporary 

 sheet iron stack leading from the furnace to the assay room having 

 become worn out, a permanent brick stack has been constructed. At 

 the same time a solid stone floor was laid and a new pot furnace for 

 making small crucible assays built." The Curator of the Department 

 of Botany in the prosecution of his notable work in the herbarium, 

 extensions to which have been necessary during the year, says : 



