468 THE JOURNAL OF GEOLOGY. 



The Idaho exhibit is fairly good, but not thoroughly charac- 

 teristic of the state. The most prominent features are the silver- 

 lead ores from the northern part of the state, green copper car- 

 bonates, and a mineral water known as "Idanha" from Soda 

 Springs. A number of photographs of different mining dis- 

 tricts are of interest. 



Washington makes a fairly good, but poorly arranged, ex- 

 hibit of gold ores, silver ores and silver-lead ores, and a few 

 other products. The coal resources of the state are entirely 

 neglected, though they are well represented in the Washington 

 state building. This separation of the mining products of a 

 region, and their distribution partly in one building partly in 

 another, is a great mistake, as it gives a person who sees only 

 one of the exhibits an incomplete and therefore an erroneous 

 idea of the resources of the state. The exhibit should be all in 

 one or the other building. 



Oregon makes a large exhibit of auriferous quartz and shows 

 a very good working model of hydraulic mining. Some build- 

 ing stones are also represented. The exhibit is very good so far 

 as it goes, but it does not do_ justice to the state, as many of its 

 developed and undeveloped resources such as iron, coal, etc., are 

 not represented. 



California makes a good exhibit, and one characteristic of 

 the resources of the state. It is very appropriately composed 

 largely of gold ores and a display of the methods of gold min- 

 ing. The auriferous quartz of the celebrated Grass Valley and 

 other localities is well represented. An interesting feature is a 

 wooden model by A. C. Hamilton showing a system of mine 

 timbering. Stibnite from San Benito county and the metallic 

 antimony derived from it are also represented. Among the other 

 prominent features of the exhibit are iron ores, asphalt, oils, 

 slate and a beautiful display of ornamental and building stones. 

 The so-called " onyx " from San Luis Obispo county, and the col- 

 ored marbles from Inyo County are exceedingly beautiful. The 

 exhibit is entered through arches built of the various ornamental 

 stones of the state, while blocks of rock containing the beauti- 



