Mineralogy and Geology. 435 
The following is the mean of two analyses : 
. Oxygen. 
Vanadic acid, - - - 22°46 5°82 3 
Oxyd of lead, - - - 54:70 3°92 2 
Oxyd of zinc, : - - 2°04 
Oxyd of copper. - - - 0:90 
Peroxyd of iron, - - - 1:50 
Protoxyd of manganese, - - 5:32 
Waiter, : . - : 2:20 ’ 
Chlorine, - - - 
Sesquioxyd of manganese, insol. in nit.acid, 6°00 
Siliceous sand, - : - 3°44 
98-88 
2 his compound is a new one among minerals, the author pro- 
poses for it the name of loizite, in honor of M. Descloizeau 
s ient Lake in the Colorado Desert; (Commercial Advertiser, 
California.)—The desert lying on this side of the Colorado river was 
a 
Gorgonio to the eastern side of the mountains, thence along the north- 
ern extension of the Colorado Desert to the emigrant trail leading from 
the Gila river to San Diego. ‘his is a portion of country never before 
explored. ; 
Mr. Wm. P. Blake, the geologist of the expedition, made a geolog- 
ical reconnoissance of the country passed over, and has communicated 
omume 
