^6 The U'est America7i SciciiHsi. 



the cavity are lined with cacholong-, but the bottom of the cavity 

 is partly filled in with a white compact chalcedony The interior 

 of the crystal is radiated, but is of a dark chocolate color > nd 

 almost entirely altered to hematite. 



Zircon — This mineral is now mined by the ton in the United 

 States, and about $150 per ton is [)aid for it, because of the eirth 

 it contains (Zirconia) which is used in the hoods for the new in- 

 candescent gas burners. The Zircons are obtained by washing 

 out the soil resulting from the decomposition of felspathic rocks. 



Obsidian — Obsidian has been found in British Columbia, but 

 it has little value, except for the cheaper jewelery, and is rarely 

 used for that purpose. 



Paris Exposition — Messrs. Tiffany & Co. e.xhibit a collection 

 illustrating the occurrence of precious and ornamental stones in 

 North America, containing all the more important varieties, in 

 their natural state and in cut examples. The 352 labels include 

 crystals ot gold, gold and silver ornaments from Indian mounds, 

 diamonds, rubies, sapphires, topaz, emerald, beryls, garnets, 

 tourmalines, zircon crystals, peridot, quartz, amethyst, opal, 

 agate, rutile, turquoise, amber and many other minerals not so 

 well known to the public as gems. 



Turquoise— Additional evidence of the antiquity of the tur- 

 quoise workings' of New Mexico and Arizona has been gathered 

 by the Hemenway Expedition under the direction of Mr. Frank 

 H. Gushing. About ten miles from Tempe, Arizona, a shell en- 

 crusted with turquoise and garnet, representing the form of a 

 frog, was found in the excavations. 



Chrysophrase — Beautiful semi-transparent chrysophrase ol 

 fine color occurs in Tulare countv, California. This gem has also 

 been found in Douglas county, Oregon. George F. Kunz. 



BIBUOGRAPHy. 



J. Jenner Weir — Exhibited a female example of Danais 

 plexippus from Custer county, Colorado, to South London 

 Entom. Society. This specimen differed from the examples from 

 more northern localities, in having all the spots on the black 

 apical patch on the fore wings white, instead of fulvous. Mr. 

 Wier also exhibited Pieris oleracea. and stated that he had heard 

 from Mr. Scudder that this species could be readily distinguished 

 from P. Napi in the larval and pupal stages. Entomologist, Feb- 

 ruary, 1889; page 52. T. D. A. C. 



J. W. Douglas — Notes on some British and exotic Coccide. 

 Ent. Mo. Mag., March, i88g. page 232. Notes on Icerya pur- 

 chasi, partly quoted from Prof Riley and Mr. R. T. Lewis (in 

 litt-) with figure of the larva of Icerya. Hippodamia ambigua 



