358 Field Museum of Natural History — Reports, Vol. III. 



decomposition. Some small meteorite specimens were also in- 

 stalled in their proper places in the collection. In Hall 65 a large 

 mahogany case 5 feet square by 8 feet high has been provided for 

 an exhibit of selenite crystals from Utah. These are mounted 

 in the form of the geode in which they originally occurred. The 

 case is provided with glass on one side and the interior is lighted 

 with electricity. A large number of crystals are shown in this 

 exhibit, many of them weighing between 50 and 100 pounds each, and 

 the restoration of the conditions under which they were found in 

 nature has been made as realistic as possible. A case has also been 

 provided in this Hall for the remarkable fulgurite, 9 feet in length, 

 obtained from Indiana, and the specimen installed therein. The 

 remaining collections in the Hall have been completely rearranged 

 and labeled and some new material added, including the specimens 

 of concretions and potholes brought by the Curator from Bermuda. 

 In addition to the exhibits named the Hall as now installed contains 

 two cases of cave products, one of ripple marks, mud cracks, etc., a 

 half case of glacial material and a half case illustrating rock weath- 

 ering, two cases of concretions and one case of septaria. In order 

 to complete the labeling of this Hall temporarily, about 200 writ- 

 ten labels were prepared and installed. A similar rearrangement and 

 labeling has been made of the material in the wall cases in Hall 

 66. A half case is now devoted to rock textures, a half case to rock 

 jointing, two cases to volcanic products, a half case to faults and 

 folds, a half case to dendrites, a half case to oolites, a half case to 

 veins, and a half case to products of metamorphism. A considerable 

 quantity of rough building-stone and marble material of various 

 sizes which had been obtained from a number of sources was reduced 

 to uniform size for installation with the regular building-stone and 

 marble collection in Hall 67. Twenty four-inch cubes of limestone, 

 sandstone, granites, and other building stones were added in this way 

 to the building-stone collection and six large polished slabs of granite, 

 diorite, and other eruptive rocks. In addition about 100 specimens of 

 polished marbles smaller than the standard size were grouped by 

 locality or pattern in frames of the standard size of 10 x 15 inches and 

 added to the marble collection. Twenty-five of these frames con- 

 taining from one to eight specimens each have been installed and thus 

 a considerable number of important specimens which it had not been 

 possible to exhibit hitherto was added. About 70 temporary labels 

 written in white ink on black cards were also prepared for this collec- 

 tion and installed. A series of specimens illustrating the manufac- 



