22 



Field Columbian Museum — Reports, Vol. II. 



labels and specimen mounts have been devised and will be incorpo- 

 rated in the installation during the coming year. 



In Hall 65, devoted to structural geology, an exhibit of cave 

 formations and cave life has been prepared. Stalactites, stalagmites 

 and other cave formations from several well known caves of the 

 United States have been mounted in their natural position and a 

 realistic setting corresponding in form and details to a typical lime- 

 stone cave, given. Accessories illustrating water, and animals which 

 live in caves, such as bats, blind fish, crayfish and crickets are 

 also used. The whole illustrates the nature and manner of growth of 

 limestone cave formations and the living forms which characterize 

 such caves. Owing to the darkness of the interior of the case from 

 its being enclosed on all but one side, electric lights are used to illu- 

 minate the interior. The other cases in the same hall have been 

 lined and repainted, the specimens thoroughly cleaned and re- 

 installed. A case containing a collection of claystones has been 

 added. About half the cases containing the systematic mineral col- 

 lection have also been lined and painted, the specimens cleaned, 

 carefully re-identified and re-installed. The Chalmers crystal collec- 

 tion received from exhibition at the Paris Exposition has been 

 installed in Hail 64. The w^ork of transferring the invertebrate fossils 

 to the mounts of manila board described in a previous report has been 

 continued, in preparation for removal of the collection to new cases 

 now in process of construction. A foreleg, complete with the excep- 

 tion of a few foot bones and including the shoulder girdle, of the 

 large dinosaur Morosaurus, has been mounted and installed in Hall 

 36. A femur and humerus of Camarasaurus, which are the largest 

 dinosaur bones ever discovered, together with several vertebrae and a 

 rib of the same animal have also been placed in this hall. These 

 specimens are of especially high scientific value and interest. 

 The collections in Hall 79, devoted to ores of the base metals, 

 have been completely re-installed. The old cases were removed and 

 new cases, purchased in part from the United States Commission to 

 the Paris Exposition, substituted. These cases are constructed of 

 mahogany and plate glass and represent a permanent style of instal- 

 lation. The types of cases employed are three, a wall case, a flat 

 floor case and an upright floor case. The wall cases are twelve feet 

 long and seven feet high. The upper portion of the case, designed 

 for the exhibition of smaller specimens, is ten inches deep and is 

 fitted with five slanting shelves. Specimens installed on these 

 shelves are mounted on mahogany blocks beveled to make a 

 level support, to the front of which the label is attached. It is found 



