200 Field Museum of Natural History— Reports, Vol. X 



Dakota. Another wood opal from Texas, and a smaragdite, were 

 obtained from Mr. C. S. Brock, of Houston, Texas, in exchange for 

 wood opal from another locality. 



A specimen of the unusual agate of Datil, New Mexico, was 

 given by Mr. Edward M. Brigham, of Battle Creek, Michigan, and 

 a good group of the Arkansas rock crystals was presented by Mr. 

 J. A. Bauer, of Hot Springs, Arkansas. 



Mr. Frank Von Drasek, of Cicero, Illinois, added to his gifts 

 of previous years a collection of thirty-three minerals from Hot 

 Springs, Arkansas. Mr. William Gardner, of Chicago, presented a 

 collection of twenty-seven m.inerals and forty-five fossils from various 

 localities, which contains much material of interest. 



Twenty-seven choice minerals were added to the Museum 

 collections in Hall 34 through two exchanges with mineral collectors. 

 Twenty-one of these came from Mr. E. Mitchell Gunnell, of Gales- 

 burg, Illinois, in return for fourteen minerals from the Museum, and 

 six from Mr. Fred Pough, of St. Louis, Missouri, were received 

 in exchange for eight from the Museum. 



Twelve specimens were added to the meteorite collection by 

 exchange. Specimens of six falls not hitherto represented were 

 obtained from Professor H. H. Nininger, of Denver, Colorado, in 

 return for ten meteorite specimens from the Museum. Better 

 representation of meteorites from the craters of South Australia and 

 of the great Hoba Farm meteorite were secured from the Kyancutta 

 Museum, of South Australia, which received in exchange four 

 meteorite specimens. 



Additions by gift and exchange to the collections in Clarence 

 Buckingham Hall (Hall 35) illustrating structural and dynamical 

 geology were greater in value but fewer in number than usual. The 

 two accessions of most importance were the collection of cave prod- 

 ucts of the Luray Cavern already mentioned, and a collection 

 of Hawaiian lavas. These lavas and volcanic products, which will 

 effect a great improvement in the appearance and interest of the 

 exhibits, were obtained from Mr. Edward Brigham, of Battle Creek, 

 Michigan, as an exchange for a small selection of minerals. They 

 form a large collection, unusually well selected, representing all 

 phases of the lavas of the Hawaiian Islands, including such features 

 as peculiar lava surfaces, lava stalactites, and the fibrous Pele's hair. 



The claystone collection was enlarged by a gift from Mr. Charles 

 Marriott, of Sault Ste Marie, Michigan, of forty-eight claystones 

 selected for their imitative shapes. Miss Virginia Lee, of Ableman, 



