EXHIBIT AT PAN-AMERICAN EXPOSITION. 219 



and one or more modelers, besides the attention of the curator of the 

 section, for a large part of the time until the final installation at 

 Buffalo. 



The details of the exhibits of the various divisions are given below. 

 No exhibit was made by the section of paleobotany. 



I.— DIVISION OF GEOLOGY. 



The exhibit for the Division of Geology proper comprised five wall 

 and one special case, four of the wall cases being occupied by cave, 

 hot-spring, and geyser deposits, concretions, and silicitied woods. 

 One ease was set aside for an exhibit of the rocks of the Hawaiian 

 Islands, the recent annexation of which rendered a special exhibit at 

 this time appropriate. The following transcript of the label which 

 accompanied this last collection is sufficiently descriptive for present 

 purposes: 



ROCKS FROM THE HAWAIIAN ISLAXDS. 



The Hawaiian Islands are eight in number, lying near the north tropic between 

 the parallels of latitude 19° and 22J°. They are of volcanic origin, but volcanic 

 activity has ceased on all except the island of Hawaii, the largest and most southern 

 of the group. The rocks of the islands are therefore all of an igneous nature, with 

 the exception of the limestones of the coral reefs which were formed along the shores. 

 The collection here shown consists of a series of specimens collected mainly from the 

 islands Oahu and Hawaii by members of the Wilkes Exploring Expedition in 1840, 

 by A. B. Lyons in 1892, and Prof. C. H. Hitchcock in 1899. It is intended to show 

 the characteristic forms of the lavas and the ordinary rock types, as well as the soils 

 resulting from their decomposition. 



Perhaps the most unique exhibit pertaining to this division was a 

 collection of such of the elements, exclusive of the gaseous forms, as 

 are found in an uncombined or free state in nature. The transcriptof 

 the general label for this exhibit is given below: 



THE NATIVE ELEMENTS. 



Of the seventy-two known elements, there are, with the exception of certain gas- 

 eous forms, but sixteen which have thus far been found in the earth's crust in a 

 native or uncombined state. These sixteen are as follows: 



1. Carbon. 



2. Sulphur. 



3. Selenium. 



4. Tellurium. 



5. Arsenic. 



6. Antimony. 



7. Bismuth. 



8. Gold. 



9. Silver. 



10. Copper. 



11. Lead. 



12. Mercurv. 



13. Platinum. 



14. Iridium \ Iri(losmine . 



15. Osmium ) 



16. Iron. 



So far as possible these are shown in the accompanying collection. Iridium and 

 osmium are shown only in the form of the natural alloy Lridosmine, and selenium as 

 selen-sulphur. Lead occurs native in but minute quantities. Palladium lias been 

 reported native, but is extremely rare. 



